YEsterday I got true duals put on my 1986 Trans AM.

In the summer, I installed a 350 w/ cam, TPIS level 4 prom, ADJ fuel REG, new injectors.

I felt That I needed an exhaust to complement all the changes. My muffler guy said he could pu ttrue duals on. He wanted me to put 3 chambers flowmasters on, but I chose the chambers. These are special race mufflers that are encased in a 3x8 case. This makes it extremely low profile. After two hours, he completed an exhaust job that looked factory. He actually mounted all the piping and mufflers higher than the 3 inch sotck pipe. I will never have a scraping problem. The cool thing is that in the installation he designed the mounts so that's it's completely bolton. If i loosen 5 bolts, My whole exhaust from the manifold back just pops off.

The sound is incredible. I had two complements just 4 hours after the exhaust job. And when I push the car, all the head s turn. It might be a little too loud, but i'll see if i get into trouble. If i do, the shop said he will make pipes so that it will exit out the rear looking like stock.

Ther performance is without a doubt an improvement. it climbs up the tach a lot faster than it used too.


Saying all this, I now have a used 80 series flowmaster with the 2.5" elbows going into 3 inch bolognas up for grabs. Any offers, I live in the Bay area.

 

How does the sound of the 80 Series compare with the Duals?? What are the differences in sound??

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Looking For:

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

 

Definitely choppier...and about 2-3 times louder. when you gas the gar, it sorta sounds like a harley and when you let off the gas, it pops. it just sounds mean. it might be a little too loud for where i live though, so i might have my muffler guy make pipe so I can have it exit the rear of the car.

 

how much are you selling the 80 flowmaster. is it the whole cat-back or what. and do you have pics of it, thanks. i also live in San Jose

RED82TA5.7L

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1982 Pontiac Trans Am
Cross-Fire Injected 5.7l V8
Eldebrock Headers, 1 stupid Glasspack right after the cat and dumps out before the rear axle.
Mods: 1.6 Proform Roller Rockers, electric fan.

Future mods: X-Ram( Aftermarket Cross-Fire Injection Manifold that proves to have as much power as TPI www.x-ram.com )
Cross-Fire Injection after market chip that says that it will proform like 90's injections.. http://www.turbocity.com/CorvetteCro...ECMUpgrade.htm

[This message has been edited by RED82TA5.7L (edited October 23, 2000).]

 

What size pipes did they put on? Also what mufflers were they? Do the pipes dump before the rear axle?

 

See the guy used 2.5" pipes. The mufflers are 2 chamber flowmasters. They are smaller than regular 2 chambers. They are encase in a 3x8 case and is 14" case. It dumps before the rear axle.

I'm gonna see if the cops are gonna give me trouble. if so, then the dude said he could bend pips over the axle and exit the rear to look stock. i might do that.

 

2 chamber, so u have 2 40 Series Flowmasters. How did the 80 Series sound, because I might be getting 1 for the IROC 350 when I get it, would u recommend an 80??

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

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

 

Yeah, I would rec the 80 series. it had a nice deep rumble to it. Sorta miss that. Mine isn't that deep anymore. I think I can get it deep if I go over the axle and exit the rear with Bolognas. I might do that to see what it will sound like and if i don't like just cut it off.

But, go with the 80 series. When i took off the cat, it sounded really good.

 

oops. i just checked me e-mail.

RED82TA5.7L

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1982 Pontiac Trans Am
Cross-Fire Injected 5.7l V8
Eldebrock Headers, 1 stupid Glasspack right after the cat and dumps out before the rear axle.
Mods: 1.6 Proform Roller Rockers, electric fan.

Future mods: X-Ram( Aftermarket Cross-Fire Injection Manifold that proves to have as much power as TPI www.x-ram.com )
Cross-Fire Injection after market chip that says that it will proform like 90's injections.. http://www.turbocity.com/CorvetteCro...ECMUpgrade.htm

[This message has been edited by RED82TA5.7L (edited October 23, 2000).]

 

I have a friend that put true duals on his 99 Z-28. He bought Mac headers, and the Mac Y pipe, and then the exhaust shop cut the Y out of the pipe and ran dual 2 1/2 all the way out the back side by side in the factory location. It's pretty clean looking, and he still has 2 cats. He is running 1 chamber race flowmasters. They are tucked up where the factory muffler would be. It took a lot of work, and all together cost him about 1500, because of all the time it took. His car is loud, and pops a lot when you let off the gas, but it is a 12 second flat car with A/C, and every factory option still on it, and has excellent driving manners.

 

So the 80 Series is good. How loud is it though??

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

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

 

I have an '80-series flow on my car and I'm luvin' every moment of it. I kept the stock cat (after reading a couple articles justifying that it wasn't worth the $$$ for performance with exhaust being my only real mod) and had a 3'' pipe installed that goes into the flow and splits out back into 2. Sounds LOW, MEAN, AND AWESOME Suddenly, my car became the blue-car of the town, to the "really nice sounding" blue car around town. The compliments stack up pretty quick... and I'd definitely recommend an 80-series if you want that famous flowmaster sound. Deeper than the higher pitched mustangs (40-series) and has more bark too. Note: you should also allow the muffler to break in for a coupla' weeks. It gets throatier and a bit deeper. The performance gains also become more evident. Happy, and loud, driving!
Car-alarm-set-off-count-as-of-date: 4. Not obnoxious, but not something your going to miss when I drive by. Exactly what I was lookin' for.

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Brian P.
'91 TransAM: 305TPI -=flowed=-

 

Thanks!!!!!!!!

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

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

[This message has been edited by IROCZTWENTYGR8 (edited October 24, 2000).]

 

You can't compare the sound of dual 80 series mufflers to a single muffler. The 80 series muffler for Thirdgens is a crossflow design, which hurts flow and gives a 'wannabe duals' look, IMO. Go with a single 40 series muffler, 3" in and out, and not only will it flow better, it will sound better than an 80 series ever could. The 80 series mufflers are responsible for the 'metallic' sound reputation Flowmaster has. My 40 series rumbles like thunder. I'm not sure what pvknight means about 'higher pitched' Mustangs; most sound much nicer than Thirdgens do, with factory headers and duals.

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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

supposed 'peanut cammed' car (yeah, right)

Built on Wednesday

 

I want a muffler that is loud and muscular, but I have to have dual pipes. Does Flowmaster make the 40 Series with dual pipes, and do they make an 80 Series completely 3 inch??

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

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

[This message has been edited by IROCZTWENTYGR8 (edited October 24, 2000).]

 

"bolagnas"


What the **** does cheap lunch meat have to do with an exhaust sytem? LOL

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Nice car: 1988 Formula 355, mildly ported/polished Vortec heads, RPM intake, Comp Cams Extreme 268 cam, 650 Holley double pumper, 5-speed/3.73 Richmond gears, and N02 on the way
Old 1/4mile: 13.5@105mph

Evil Car: 78 Pontiac Grand Prix, 500inch caddy motor, edlebrock intake,HP Holley 750 DP race prepped carb, B@M TH350 tranny, 16inch Iroc-Z rims, blacked out chrome, soon to run 10's...

There's no replacement for displacement!

[This message has been edited by ChrisFormula355 (edited October 24, 2000).]

 

Does anybody know if it is illegal to put true duals on a car that never came with duals (y pipe). Will it pass inspection? Does it effect the emissions at all?

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I never knew a stroked ford could be so slow

 

Hey, Could Ya Give the Name of the Place who Put those On, And the Price ?

I just bought My 85 And its still Got stock exhaust, They Guy Down here wants 300 To put a 3 chamber PoS Single inlet Dual outlet In there, I would Rather Go The Way you Have




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85 Z28 - Daily Driver
60 Ranchero - Project ( Money Hole )

 

damnit man im getting your set up!!!.....its time to be loud and proud!!!! 2.5's with series 40's COMING RIGHT UP!!!!!

 

DIE the only requirement (by law) is you need a cat and muffler on each pipe. If your serious about getting custom true duals you should have an H-pipe created, this is soposed to promote low-end torque by equalizing back pressure.

 

ok so does flowmaster 40 series come with single in/ dual out?? and how much did you spend on the true dual setup...if the price is right i may just drive to SJ from SF to do the same. thanks

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Rick
90 Camaro RS 305 TBI
350 on the way!!

 

My formula w/ 80 series is deeper and meaner sounding than 90% of rustang out there(4.6l's can't step to this).80's does take a while to break in.It also gave me some ponies.I have some awsome crome tips too.Of course the single pipe all the way back gives a few more vs crossflow.But as a f-body owner we all know looks and style must go hand in hand.

 

ok, few questions, first, could you post a pic of the entire sytem. id appreciate it. also, what did it cost and where did u have it done. i am planning on doing a true dual 3inch system, with an H pipe, random technology cats, and Borla XR-1 race mufflers. i figure that the cats will take the sound down enough and that the borlas will help a little i need to know how he ran it. i want to dump out the sides in front of the rear tires. please email me pics or post them here if you can. thanks a lot.

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1988 IROC-Z 350 TPI
(its an original 350 car)
License Plate: STG KLR 1
Engine Mods:
Edlebrock TES Headers, Hypertech Chip, Flowmaster Muffler, Intake Airfoil, Removed MAF Screens, bored .030 over, Other minor mods
Trans Mods:
2,500 stall converter, Redline clutches,Heavy Duty Steels, Trans-Go reprograming kit , Heavy Duty 2-4 band, Corvette Servo, B&M Mega Shifter w/ Carbon Fiber Handle (looks sweet in a black car!)

Best Time So far: 14.104@99.66 Told you id go faster
"If you can put it on your car, its fair" Quote By Guido
Foundering Member of the Illinois Overkill Crew (IOC)
http://www.suempresaenlinea.com/drowned/images/iroc-black.gif[/img]

 

Where did the acutal Mufflers go? did u put them where the stock cat was *under the passanger door* , if so , where did u put the 2nd one? any info would be appreciated.

 

He fit both where the cat used to be. That's why I said they were a special flowmaster since they were encased in small cases. They fit side by side with no extra room.

By the way, it sounds a hell of a lot meaner with pipes goin back to the stock locations. So now even though I have true duals, it looks like I have stock exhaust. A lot of people have said that my exhaust sounds a lot better this way than when I had it come out before the rear axle.

And for some reason, even the muffler guy said that this was weird. IT'S LOUDER...

 

Just wanted to know what you did with the O2 sensor that ran into the Cat.I heard that if you remove it, it kills your gas millage and you loose some hourse power. Just wondering.

 

On a v8 thirdgen your o2 sensor is located on your driver side manifold/header. It is not in the way. However on a v6 it would be a problem since it resides on the passenger side, right before(?) the y-pipe. If you have a v6, all you have to do is have a o2 sensor tit welded in on your new pipes. hope that info helps out. oh yeah, yes having your o2 disconnected would make your cat go bad faster, never go into closed loop and your MGP would go down.