DeltaElite121

The only thing I liked flowmasters on was my 5.0 Mustang. That's the ONLY car I liked them on. Had them on my last Camaro and they sound like crap. I'm sticking with Borla XR-1's. My next exhaust on a mustang will be Dynomax Ultra-Flow's.

Chevy86 IROC-Z

iTrader: (17)

I can still make out your license plate, My best guess is 5BSU783. If You want, I can blend up the bumper to rid the license plate number reflection.

1nasty86

iTrader: (5)

and from what ive seen flowmaster has the WORSE rep for not making power.. friends 2011 novi 5.0 gained 37rwhp switching from flowmasters to magnaflow's... proved dyno results another friends ls2 gto made 394 with a mild h/c/i and the tuner was left scratching his head... yanked the mufflers and it made 431......

Chevy86 IROC-Z

iTrader: (17)

If you can provide a graph or a picture of the DYNO results, I believe ya. But words dont really mean a thing. Hell, with my stock TPI runners and intake base, I'm producing 367 hp at the rear wheels. Naturally asperated baby!

89RS_82Z

iTrader: (2)

That was my reasons, along with every teenager with a cruddy azz Z71 has them and rides all over town going .... BLAH BLAH

I had mine for 8 years (3" no cat flow 80) ...... main problem was the drone inside.

Just my on why I switched, but to each their own, its your car put on it what make you happy, thats all that matters!!

I switched to a Cherry Bomb Vortex, no drone inside, and its plenty of loud outside
http://www.youtube.com/watch?v=U_l8O...5&feature=plcp

1nasty86

iTrader: (5)

gto owner has moved but i can probably get the graph for the 5.0, check this out...
http://m.modernhemi.com/forums/showthread.php?t=1471050
and as for making hp naturally aspirated.. im making 463/434 with stock casting gm heads.. i picked up 20 rwhp open vs. closed cutout on my car with a mangaflow and the maganflow MURDERS the flowmaster in cfm of flow so what do you think that would translate to??

newbluehair

I love my Magnaflow set up.

Chevy86 IROC-Z

iTrader: (17)

I was just BS'ing about my 367 HP at the rear wheels. Never ever ever ever can a Stock TPI make that much HP, Unless it has a Super Charger (and like I said before, prove me wrong with visual data). Mine barely goes over 220 HP.

ASE doc

I originally went with an Edelbrock Performer cat back with a 3x15" Dynomax Bullet where the cat once was. The Edelbrock muffler looked good and sounded okay when it was new but after 15K miles the thin outer skin started to crack apart. I replaced it with a Flowmaster 80 series and removed the Dynomax. I love the sound. Of course my engine is no where near stock and that's what you really hear. On full throttle it sounds and accelerates just like the NASCARs Ive built. In fact, I think it would probably outrun some of them.

The one change I would like to make is that I can hear the single 3" through the dual outlets. I want to replace it with a true dual system.

whatever84

I get a kick out of this thread. Flowmaster is one of the top selling aftermarket mufflers period and not all Flowmasters sound the same. I have heard some great sounding Magnaflows, Cherry bomb (welded), Borla and Hookers but I prefer the Flowmasters and again it makes a big difference in sound if the motor is built up or stock. To each his own.







Mark.
PS, This is that test sheet again, Barley a 4hp difference, you would never notice that on the street.

Orr89RocZ

iTrader: (20)

agreed, most of it is just internet lure but it greatly depends on what model you get. The quieter flowmasters are abit restrictive compared to a straight thru core muffler like magnaflow.

I've seen more than a few race series flowmasters on 10-11 second cars at the track. They can work.

That said, I liked my 80 series 3" system. It was ok but nothing like the chambered tube custom exhaust I replaced it with. My car didnt go any faster with the swap but sounded more aggressive. Cat delete helped alot with the volume tho but the tone was all chambered tube.

1nasty86

iTrader: (5)

that was also on what appears to be a mustang.... which has duals. the link i posted is of one muffler vs. another in a cfm flow test. only flowmaster i would use would be single chambers.

STREETDEMON

come on now....let's be realistic here. no tpi i've ever been around has throttle response and power like a full race nascar engine......

whatever84

It is a mustang, But the horse power difference would probably be the same Chevy or Ford with 370rwhp except that a lot of our cars run a cross flow muffler(which I wouldnt run). What I was pointing out was the power was about the same between all those mufflers and if the power was about the same then the cfm doesn't really matter. Anyway its all good, its really a personal opinion on what you want to run and I like Flowmasters better then most of the others. But like I said I wouldn't run a 80 series, Mine is a 3inch single in, single out 30 series race muffler and it has a great tone and on a side note I don't like a third gen with two pipes under the bumper but there again its all an opinion.

Mark.

ASE doc

You haven't ridden in my car. Keep in mind also that there are several different classes of NASCAR. The cars and engines I used to build were Sportsman class which run between 450 and 500hp depending on too many variables to mention. These are fast cars and a blast to drive. I think my Beasty would give one a real run for it's money. Very few cars could run with a "full race" NASCAR. I have seen several NASCAR small blocks dyno at around 700hp. Outlaw motors might run 800hp. These are naturally aspirated small block Chevys and Fords with a single 4 barrel carb, and in many cases, cast iron straight plug heads. Sorry, off topic.

bdt6661

Just an idea, I personally like my exhaust pretty loud, but I tried a set of those Flowtech Raptors just before each tip (custom true duals), and those quiet the exhaust down quite a bit while still sounding pretty mean. I'd go buy those again in a heartbeat. At higher RPMs they do cackle, but for normal driving, they're great

bdt6661

By the way, those are turbo mufflers, but they sound chambered

InfernalVortex

iTrader: (4)

Man that chart makes me want to go flowmaster pretty bad... Still I cant get a Super 40 in a 3.5-3.5. However I did just discover that Hooker now makes the aerochamber for a 3.5 pipe... I think I see that in my future...

whatever84

--------

Camaro305SB

I'm confused are people still under the impression that mufflers grant horsepower? Hmm... I guess we aren't as far up on the evolutionary line as I hoped....

In all seriousness, regarding muffers - get something you like the sound of. End of story. I think flowmaster mufflers need to be on a true dual system to sound good, but thats just me. I don't bash any mufflers because everyone has different taste.

1nasty86

iTrader: (5)

so your trying to say a direct replacement borla/magnaflow/hooker muffler would not gain power over a stock muffler?

BlackenedBird

iTrader: (5)

Not "gain" but will free up restricted power. They will, because the stock muffler is over-restrictive & designed for sound reduction.

1nasty86

iTrader: (5)

well by my book when you go from 200hp to 210hp by replacing the muffler you GAIN horsepower... if your gonna use that logic then a set of ported heads would "free up" restricted horsepower.. not gain it. a bigger camshaft would also "free up" restricted power.. not gain it.. i rant about this because i have seen f bodys pick up power with "most" ANY other muffler over a flowmaster, but if yall like a flowmaster then more power to yall!

BlackenedBird

iTrader: (5)

Pure & simple.....The engine is what makes the power. The exhaust is just getting rid of the "waste" & determined how well the gases can get out for the ENGINE to do its job making the power.

I'm not a Flowmaster "worshipper" (which is what you seem to think of those who like them). I run a Magnaflow catback, so I'm not here just to stand up for Flowmaster. I'm her to correct a wrong impression.

STREETDEMON

...

STREETDEMON

says the guy with the LG4.....

a properly tuned exhaust system will produce more power than straight pipes dumped. its called scavaging. there is a lot of science and time one could put into an exhaust system, but doesn't make much sense on a sub 200rwhp car.

freeing up flow and creating a scavaging effect will net you more horsepower. it takes a good muffler design to do so.

1nasty86

iTrader: (5)

theNMBR27

If you want to hear a hooker Aerochamber on a stock engine car search me on YouTube. Same screen name. I'll have to make a new one with the cam and heads when the weathers better here.

Ron U.S.M.C.

I had a question but figured it out using the next reply.

Ron U.S.M.C.

Thanks

85_ZED28

Couldn't find it. Do you have a link?

theNMBR27

http://www.youtube.com/watch?v=Z7VgT...e_gdata_player

RWB____s

What I have never seen is a flow chart that compares "comparable" muffler designs under a controlled testing enviroment. Not one that is squewed to favor one design over another.

InfernalVortex

iTrader: (4)

Bold words, you sure about that? You're calling US neanderthals because YOU prefer to use unusual semantics and verbage?

Your claims have been thoroughly discredited, but every performance modification you do to an engine increases its efficiency (in some cases only in certain RPM ranges) in some way or another. If a better muffler improves an engine's volumetric efficiency by evacuating more exhaust gasses so that more fresh gas/air mixture can get into the cylinder on each intake stroke, then is that a "gain"? Or is it increased efficiency? It's more power either way, because the operating conditions inside the engine itself have subtly changed.

You argue the engine makes the same power regardless, just that magic mufflers break the laws of physics by allowing the same power as before to simultaneously be MORE power afterward. The reason there is more power is because you've changed the engine's internal operating conditions in a way that allows it to work more efficiently.

1nasty86

iTrader: (5)

dabird07

iTrader: (10)

i wonder if my 305 would sound like that?

coreys90iroc

iTrader: (1)

why I hate flowmaster...
every dumbass puts a flowmaster on thier car,
they drone,
sound like **** on low compression/stock motors,
they ARENT as good as people think around here there called CHOKEmasters (dyno proven to suck)

but yeah they sound good on nasty hi compression big blocks!

Carlos773

iTrader: (3)

So the census is pretty much, everyone and their mother has one, so I must be different and hate. Figured.

To me I am not a fan because of the sound, never liked them on stock third gens. Yet If I recall I have heard some built up cars with them that sounded very nice.

whatever84

Wow big words on the Internet,(guess i'm a dumba&& too) They have been tested on a 370 rwhp mustang and of all the mufflers they tested they were all within 4 hp of each other so they hardly suck, Like I said it's all opinion. And just so you know they sound good on higher compression small block too .

Mark.

Screamin86

iTrader: (1)

The cross flow flow master sucks bad but the normal ones aren't so ba that's prob why the mutang didnt show a diff in power.

whatever84

I haven't seen a test on the crossflow and I have never used one but I'm sure your right, I wouldn't use a cross flow anyway. It's all good and It's all a matter of opinion. Cheers.

Mark.

89RS_82Z

iTrader: (2)

people hate flowmasters equaly even on the ford ranger forum and accord forum

ninetyone

iTrader: (2)

Summit fully welded race muffler on a TPI 350 (single out) ,looks like a flowmaster

Ron U.S.M.C.

I am by no means a engineer , but maybe we are do for a "high flow" Flowmaster 80 series. Just cut away about 10 to 15% of the baffling while keeping the internal design but being less restrictive.This is the stock 80

Chevy86 IROC-Z

iTrader: (17)

Perhaps cutting away the v shaped dam would help. Imagine the difference in sound that would create!!!! I wish I had a shop and welding experience. I would hack my 80 series in a heart beat. Lol

Camaro305SB

Oh - I must not know a damn thing about engines since I have an LG4. Well, I guess I'll stay out of this one then. If we're talking about exhaust scavenging and mufflers in the same sentence I guess I have nothing more to add. BTW I was referring to adding a performance muffler to an otherwise stock exhaust system. But, again, I have an LG4 so what do I know....

ninetyone

iTrader: (2)

You have to look at the lower end rpms too. Not just the high rpm hp results. You do most of your driving at lower rpms.

ninetyone

iTrader: (2)

Its velocity(exhaust speed) that creates more power.That is why too large of an exhaust slows down exhaust speed and makes less power.Yet , again it all depends on how much motor you have. Of course a motor making lots of power or with certain mods will benefit from larger exhausts.

whatever84

I know and it is real close all the way around, low RPM's all the way up. I really shouldn't be in this thread since I'm not a FM hater anyway. It's all good.

Mark.

ninetyone

iTrader: (2)

I think there was like a 20ft/lb torque and hp difference in the lower rpms. The Borla xs and the Flowtech Warlock made the most power compared to all the rest in that test.