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1987 GTA Flowmaster???

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Old Mar 31, 2009 | 04:17 PM
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1987 GTA Flowmaster???

Im planing on installing some headers and making my GTA dual exhaust, i have gone to the Flowmaster website and im unsure wich to get. i want Performance most of all and aggresive sound. i was palning on geting the 40series but dont know wich (delta, etc...) any suggestions.
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Old Mar 31, 2009 | 04:47 PM
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Re: 1987 GTA Flowmaster???

It really depends how you are going to fab your duals up.. So.... what's the plan?
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Old Mar 31, 2009 | 05:19 PM
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Re: 1987 GTA Flowmaster???



im trying to go with 3in tubing but depends on how much it cost
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Old Mar 31, 2009 | 08:37 PM
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Re: 1987 GTA Flowmaster???

But you live in san diego will you pass smog that way i would go with which ever 40 series flowmaster also tell how much you spend at the end for i could do that
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Old Mar 31, 2009 | 09:51 PM
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Re: 1987 GTA Flowmaster???

yes ill pass the smog as long as i have the state legal hedders which are the ones with the air tubes and as long as i have the cats too.
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Old Mar 31, 2009 | 10:14 PM
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Re: 1987 GTA Flowmaster???

the super 44's will give you most agressive sound
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Old Mar 31, 2009 | 10:26 PM
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Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: 1987 GTA Flowmaster???

Originally Posted by Dany89


im trying to go with 3in tubing but depends on how much it cost
I guess this isn't a daily driver? A setup like that would be ok for the track, I assume you will be dumping before the axle? Would be very hard to do, as others have demonstrated, and keep much ground clearance. The best solution I've seen ground clearance wise is with shorties and running both pipes down the passanger side.. Anyway with a good enough custom exhaust shop almost anything is possible.. Still I'd personally shy away from trying a street legal dual exhaust system on one of these cars if ground clearance is and concern..
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Old Mar 31, 2009 | 10:29 PM
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Car: 86 Corvette, 89 IROC, 1999 TA
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Axle/Gears: 3.07, 373, 4.10
Re: 1987 GTA Flowmaster???

Here's a good link for you, this guy did just what you're talking about, think he spent a small fortune on it as well, and still doesn't have the best ground clearance.. but it IS possible.. https://www.thirdgen.org/forums/exha...ve-3-true.html
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Old Mar 31, 2009 | 11:44 PM
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Re: 1987 GTA Flowmaster???

Do you have the stock headers or which ones do you have i am planning to do that but not a dual exhaust and i live Oceanside
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Old Apr 1, 2009 | 01:42 AM
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Re: 1987 GTA Flowmaster???

if clearance will be too much of an issue ill just go with smaller tubing... is not a daily driver jsut driv eit about 3 or 4 times a week so ill see whats best
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Old Apr 1, 2009 | 01:46 AM
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Re: 1987 GTA Flowmaster???

Originally Posted by JR350tpi
Do you have the stock headers or which ones do you have i am planning to do that but not a dual exhaust and i live Oceanside
well im palning on buying either some form Dyno Dons or the Hooker 2055HKR im still undecided on that
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Old Apr 1, 2009 | 10:09 PM
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Re: 1987 GTA Flowmaster???

You should go for dyno dons i am saving up for his headers i have heard good things about his headers
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Old Apr 2, 2009 | 06:56 PM
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Re: 1987 GTA Flowmaster???

Originally Posted by JR350tpi
You should go for dyno dons i am saving up for his headers i have heard good things about his headers
Do u know if his have the 1 3/4 tube size???
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Old Apr 2, 2009 | 07:04 PM
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Re: 1987 GTA Flowmaster???

regular 40s are the loudest flow they make they have a really deep drone to them and are loud under throttle they are your best bang for your buck if you have shortys you wont be able to run three inch tubing because the way the driver side header is built it will make it to were if you go down a hill you will scrape. i have 2.5 inch and everytime i go over a bump im out of my seat waitin for it to go bang.

Last edited by 91rs5.7tpi; Apr 2, 2009 at 07:09 PM.
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Old Apr 2, 2009 | 08:25 PM
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Re: 1987 GTA Flowmaster???

Originally Posted by Dany89
yes ill pass the smog as long as i have the state legal hedders which are the ones with the air tubes and as long as i have the cats too.
your car didn't have the option of dual cats. you won't pass unless the smog tech doesn't check his books, which he most likely will if you show up with headers and a custom exhaust. not only that, to remain smog legal the cats have to be positioned in the stock location, which would be underneath the passenger seat. however you might get lucky. i know i had a hard time getting mine to pass, and mine was originally optioned for 2 cats, even though the tech said it wasn't, after checking his books he found it was optioned for dual cats, but had to be 2.25" pipe and 18"s long. even though it was 2.5" pipe and 16" long he just eye-balled it, and it passed.

if you do go with dual exhaust, do yourself a favor and get 2.25" or 2.5" exhaust, dual 2.5" is more than enough to support 500HP.
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Old Apr 4, 2009 | 05:34 PM
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From: Norwalk, CA
Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: 1987 GTA Flowmaster???

Originally Posted by Dany89
Do u know if his have the 1 3/4 tube size???
You should pm him he will tem you what size here are the pics he send me

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