I recently got a flowmaster muffler told them to put on a 40 put they put on a 80 and im pissed cause they are only open when I cant get to them and my exhaust isnt very loud, it is a notch above stock and thats about it, have any ideas?

 

ok i may be wrong on this one but im pretty sure that the 40 and 80 are the same muffler except that the 40 is a single out and the 80 is a crossflow dual out muffler...i've got an 80 series (although my sig says 40, i never changed it) and i like the sound..a lot louder than stock

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91 Pontiac Firebird...305 TBI
black, t-tops, auto
K&N 14x3 open element air cleaner, 3 inch high flow cat, 3 cat-back into a flowmaster 40 series, kenwood head unit, pioneer 5 1/2's, Infinity Kappa 6x9's, 2 JBL 10's...more mods soon!

 

um.. The 40 series is a 2 chamber, single in, single out muffler. I have one on my Jeep. 4.2L inline 6. Nice and loud. Sounds the same as the day it was put in.

The 80 series is a cross flow with a single inlet and dual outlet. I have that one on my Formula. It took a couple months to break in and get louder. I'm really surpised it did considering my 40 series didn't and flowmasters have no fiberglass packing in them. I figure it coated with soot or something. I dunno. I like it.



Its my opinion that our cars look stupid with single exaust and would rather have the crossflow than the 40 series.

-Tas
'89 Formula WS-6

[soon to be Torch Red with black hood and headlights ]

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz | ICQ 82881207

[This message has been edited by Tas (edited February 20, 2001).]

 

I have the 80 series on my car. 3" in and dual 2.5" out. I think that is the difference.

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Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

Hrmm I never knew that. I got them put on there and I could tell they sounded different from the stock exhaust that I had(the guy who owned it previously put a single in dual out muffler on there) but it just sounds deeper, but not really any louder. I could tell a increase in my car's acceleration though. I had a couple of friends that know a lot about cars listen to it and they said there was no way that it was a flowmaster 40, prolly a 80. Was I ripped off ofrr should I stay with the 80s? 150$ for the muffler, tips, and labor to put them on there.

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87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 40 Series
2 1/2 inch tips
Stock Dual Exhaust
-----Need Upgrades-----
--Give suggestions plz--

 

new sig

------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
3 inch tips
SingleIN-Dual OUT exhaust
-----Need Upgrades-----
--Give suggestions plz--

 

2 things:

1. it will get louder
2. you can get a 3" pipe from your cat to the muffler.

I was on a budget when I got mine. I got a Flowmaster 80 series(single 2.5" to dual crossflow 2.5" out) then had em put to stock '99 Z28 rear pipes and tips with the square tips. Those rear pipes are 2.2".

Mine sounds good but its not as loud as other cars with the same muffler. I think its because my pipe fromt he cat to the muffler is only 2.25". If I wanted to replace it I'd get a 3" pipe put in.

The inlet of my muffler is 2.25" but you can tell it necks up to 3" so the muffler cuts off the neck and it becomes a 3" inlet muffler. Unless you have some 350HP beast I doubt there will be a power differance between the 40 series and the 80 series but I do think dual, on each side, rear pipes looks a whole lot better than a single pipe on the left or even dual pipes on the left.

[This message has been edited by Tas (edited February 20, 2001).]

 

Flowmaster makes a 40 Series dual outlet also, not only single.

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Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.

[This message has been edited by IROCZTWENTYGR8 (edited February 22, 2001).]

 

probably but it will have both outlets on the same side.

 

Which muffler comes with the flowmaster American Thunder cat-back system? The 40 or 80 series? Is it dual outlet or single outlet?

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'88 IROC, 305 TBI(all but blown up!!)
New motor almost complete; 355 fully balanced, 9.75:1 compression, fully ported '70 truck heads(for now), Harland Sharp Roller Rockers, Comp Cams TPI cam, '90 speed density TPI with '86 base so it fits older style heads(presently being ported), AFPR, Flowmaster 3in. exhaust, Headers are coming soon, plan on burning my own chips, many more mods and parts on the way as time and money permits =(
Should have it running in a couple weeks as soon as I figure some things out.
Best E.T. with TBI 305: 16.11 @ 82mph (see why I'm putting a new motor in!!!)
Won bracket races at Numidia Raceway with my '70 Nova
Check out my buddy Jeremy Kunkel's 70 Chevelle at www.numidiaraceway.com (He's the 2000 Street Eliminator Track Champion!!)

 

It comes with the 80 Series I think, but I know its dual outlet.

------------------
Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.

 

me and 2 of my friends all have the 80 series on my formula and my friend's 94' LT1 it is loud as hell. his is louder when u get on the gas. mine is louder over all tho. and my friend's 98' Z is quiet one. I think it has to to with the crappy pipes that come with those cars stock. If yours is quiet, u have restrictive pipes. Is it possible that they could have put a 70 series on? those give u power with out the nois. By the way my exast is so good and loud i always get people comenting on it. I even got a ticket for it, even tho it's legal.

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89' Firebird Formula WS6 L98, MSD 6AL MSD Blaster, Hypertech chip, K/N filter cone,flowmaster 80 series, hypertech air foil, koni shocks, edelbrock trailing arms

 

why must people state things as fact, when they have not a clue of what they are talking about?

The Flowmaster American Thunder system has a 40 series muffler. Period. There are both single and dual outlet systems available. The dual outlet systems are one pipe per side, not two on the left.

The single outlet system flows better. The dual outlet system looks better. Since the dual outlet system doesn't give the same HP boost as the single outlet system, I chose the single outlet system, because I wanna go fast. The single outlet mufflers are smaller and much less restrictive. They give the exhaust almost a straight shot in and out, rather than making multiple turns like the dual outlet muffler.

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91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

Built on Wednesday

[This message has been edited by MrJ (edited February 22, 2001).]

 

MrJ why are you quoting me? I never said anything about what muffler comes with what catback. why? because I don't know. someone said that there is a 40 series with dual outlets, I said "probably...". I said that because there are lots of systems with single in dual out and there very well might be a 40 series that can do that. I said the outlets are on the same side because if they were on opposite sides, it would be an 80 series and no longer a 40 series. its just common sense.

 

i had a ser.40 on my car when I bought it.At first I wanted to get dual pipes but changed my mind. I like the single exhaust look. It fools people.Good.

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1990 Formula
Factory:TPI-305/Dual Cat/5 Speed,3.42 rear, Dealer:Aluminum Drive Shaft(230hp)
Mods:SLP air foil,K&N Filter, Accel:wires,coil cap,rotor.Hypertech Thermomaster chip,Stat,Fan switch.Flowmaster 3" Cat-back exhaust,TB coolant bypass, Centerforce clutch (going).

 

A 40 Series with dual outlets wouldn't be an 80 Series, because the 40 is a 2 chamber muffler and an 80 is a 3 chamber muffler. They both flow different and sound different, no matter whether thay are dual outlet or not, they aren't the same muffler.

MrJ's explaination on a single outlet muffler flowing better is correct, but I have to have dual outlets!! I also said I wasn't sure if the AT exhaust system came with an 80 Series or not, just that I know it has dual outlets.

------------------
Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.

 

dude please read closer: "Dual OPPOSITE outlets would be a 80 series" aka cross-flow.

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-Tas
'89 Formula WS-6
[soon to be Torch Red with black hood and headlights =) ]

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz | ICQ 82881207

 

just doing a muffler won't give a huge benefit in acceleration. exhaust provides more gain the closer you are to the motor when you do it, that means, a muffler will give you a little, a mid pipe a little more, a 3in cat more, and headers and y-pipe will give you the most.
as far as volume goes, get yourself a good y-pipe and a high flow cat, then you'll hear your ride yell for more gas peddle.

lata
tim

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91 Camaro RS-LO3,Auto.
14.215@94.30 w/ 1.917 60'

Check Out The East Coast F-Body Nationals Home Page
www.geocities.com/njspeeder

My MAFB.ORG Home Page
www.mycar.net/mafb/registry/detail.cfm?id=299

DSI Racing Home Page

www.geocities.com/foff667

 

Flowmaster doesn't make dual outlets on the same side. SLP does. Flowmaster makes a new AT exhaust system for the 305 and 350 TPI with a 50 Series muffler, 3in. inlet and 3in. dual outlet.

------------------
Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.



[This message has been edited by IROCZTWENTYGR8 (edited February 22, 2001).]

 

What highflow cat do you suggest getting, and y pipes?

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87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
3 inch tips
SingleIN-Dual OUT exhaust
-----Need Upgrades-----
--Give suggestions plz--

 

Yes, Flowmaster does make dual outlet mufflers, both crossflow as well as dual out on the same side:


Also while FM calls the 40 series a two-chamber, it really is a three camber and if you look, the 80 series is the same design, with a larger third chamber to allow the for the pipe crossover. I have also seen advertisements that specify that 80 series is the same as the 40 series, only a crossflow design.




Incidentally they also make a dual in/out crossflow muffler.

For direct info:
http://www.flowmastermufflers.com/fmtest/DOCS/SET.html


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"Only in Britain could it be thought a defect to be “too clever by half.” The probability is that too many people are too stupid by three-quarters."

John Major

[This message has been edited by Red Devil (edited February 23, 2001).]

 

No, what he meant by dual outlets was that he thought Flowmaster made dual outlets with the tailpipes on the same side, next to each other like SLP.

------------------
Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.

 

OK stop all the fussing, I have the american thunder system and it comes with the loudest muffler you can get which is a 40 series but it is a crossflow so it is called an 80 series simple as that. And it is the deepest beefyist exhaust system i have ever heard on a car. best system for the price and is a very easy install. if the shop that you(BUDDYLEEX) got to install the muffler installed the wrong one tell them to fix it, it is not your fault it is theres. my friend has Mac headers and Y-pipe and all he did was put the 80 series muffler(his pipes are 3" header exit,3"cat and pipe all the way to the muffler with 2.5"dual outlets) and his is louder than mine but not as deep.

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82 Z28 had LG4-305"
now has 350 carb
edelbrock performer, headman headers,chevy 1.6:1 roller rockers,rebuilt heads-3 angle valve job-prof.bowl blend-new valves,seats,3"flowmaster, Mac high flow cat
MSD6AL,700-R4--B&M shift kit, B&M tranny cooler. Sub-frame connectors, boxed lower control arms and torque arm. 1.5" front sway bar, rebuilt carb, 4" K&N, no emissions equipment, new BFgoodrich radial T/A's--215/65 front 255/60 rear
RADIO-- premier Deh-p300
2-10"kicker SPLs,ZR240,premier 434x(4 way), custom built fiberglass box for subs. pioneer 6X9 & 4X6, grant GT steering wheel

 

So Black82, you are saying that you got the loudiest muffler, which is of course the 40 series, but it is a crossflow, which makes it a 80, right? Ok well I told them to put on a Flowmaster 40, and I originally had a crossflow muffler, and Im assuming they put on a another crossflow muffler since there is one inlet, and two outlets. So what you are saying is I wasnt ripped off? Because it is a really deep sounding muffler and we have the same engine, an LG4, do you think that the muffler could not be broken in yet or soemthing?

------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
3 inch tips
SingleIN-Dual OUT exhaust
-----Need Upgrades-----
--Give suggestions plz--

 

if anyone is wondering what my complextion of my face is, its blue: YES THEY 80 SERIES WILL BREAK IN.

 

How long will it take? to break in? Ive had the muffler for about 24 days.

------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
3 inch tips
SingleIN-Dual OUT exhaust
-----Need Upgrades-----
--Give suggestions plz--

 

https://www.thirdgen.org/messgboard/...ML/001043.html

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-Tas
'89 Formula WS-6
[soon to be Torch Red with black hood and headlights =) ]

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz | ICQ 82881207

 

I had the 80 series on my car since last summer. And every month the muffler seems to get louder. So if u want to know how long it takes for the muffler to break in. Well i didn't start to notice a loud difference until like a month and a half later.

 

to BUDDYLEEX --- yes, the longer i had it on the louder it got, the harder i drove it the louder it got as well but when i first put it on it was very quiet and i did not like it but about one and a half months later it roared, even at idle it was loud--- something else i learned is that the muffler that you get with an american thunder system has a few different baffles that the regular 80 series. I went to the autorama today and asked a representative of flowmaster and he told me they are close to the same but the 80 series is even louder than mine so, I dont know exactily what to say. The longer i had it on the louder it got and the happerier i was--- so the best of luck to you.

--- I saw that you wanted some ideas for mods, I put 1.6:1 roller rockers on mine and it helped somewhat, unless if you can change the cam(it is cheaper for the cam any way), I put an edelbrock performer on my engine and it shave 20 pounds off the front(the car turned better, felt better around curves no over/under steer), I put headers on and that added to the sound and gave me more upper rpm(3500-5500) power--- but all this was seat of the pants so i cannot guarantee anything

[This message has been edited by Black82Z (edited February 25, 2001).]

 

Thats Black, I was wanting to get headers for a long time, but I wont have much more money after I put on a ram air 2 hood and get a paint job with racing stripes. But Im still planning to get headers and a edelbroke performance, I was wondering what roller rockers did for the engine?

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87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
3 inch tips
SingleIN-Dual OUT exhaust
-----Need Upgrades-----
--Give suggestions plz--

 

is it just me or does flowmasters website and catalog and contact policy suck a fat one?

 

buddyleex--- i read in hot rod and in chevy high performance that step up rockers(1.6:1) are worth about 20hp on a stock engine and 30hp on a modified one they also lower the temp of the oil on the rockers from 300*C to about 150* which does wonders for oil longevity, I think they are easier on valve stem ends too. headers are nice but are a bitch to put in, especially on Tpi camaros( took me and a buddy 10 hours to get it set with no leaks) carb ones are not that bad, it took me two and a half hours to put mine in one day. In canada mine (headman shortys with y-pipe) were about 350$ canadian. I personally do not like them but they were cheap. they rusted quick so i have to buy some good header paint. My buddy has mac ones on his Iroc they fit nice but are a pain to get in, yet they come with some sort of coating on them and they stay cool-- they cost him 800$ canadian and look better than mine. if you are in the states i hear edelbrock makes good ones but i have no experience with them. All of the info i have given is totally basied on my experience and what i read in books so you can do with it what you like