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stock V8 mufflers on a gtp

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no the camaro and firebird sound like crap because its not a LS motor :D. dude the 3800 sounds like garbage, put headers on, catless downpipe, and keep the resonator with stock mufflers thats the best its gonna sound without droning like crazy
 


rocafella2032 said:
My borla mufflers flow a lot better. Almost 2 mpg gain and they sound great
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:th_laugh-lol3::th_laugh-lol3::th_laugh-lol3:

Probably drove more on the highway.

gtpinsc said:
flowmaster 40 series DO NOT sound like crap.
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chunky said:
have a video of a nice sounding one, because IMO this YouTube - 2004 pontiac grand prix gtp supercharged 3.8L V-6 does not sound good. i do not like raspy exhausts.
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That is because the resonator is gone...plus you need more exhaust mods to compliment flow 40's.

YouTube - GTP Exhaust

01GTP said:
8 is a bigger number than 6 so it is better. noob :th_nanana:
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Which equates to 2 more MPG's like that guy up top got...must have installed V8 mufflers...
 


headers, catless dp, stock muffs. i think mine sounds good. it growls at idle and is meatier than stock. but at highway speeds it doesnt drone. i think anything else does. if your not making more than 350whp like blue said leave it alone. if it aint broke dont fix it
 
Bio248 said:
they are able to put equal length headers on it. we have a crossover to bring the front manifold to the back. uneven exhaust pulses FTL.
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exactly.

ninnyGTP said:
*edit* the reason they sound different is Firebirds/Camaros only use a single muffler and that GP had it's resonator removed
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so why run 2 mufflers on a GTP, why not remove the whole fake duel exhaust **** and run larger piping (than the Y section) into a single muffler?
 


I doubt the dic is a horrible reading, and even if its not accurate it stil increased by 2? so regardless it improved. Also i understand i havent had them on long but im seeing a consistant reading which also isnt going to change unless i drive harder.
 
rocafella2032 said:
I doubt the dic is a horrible reading, and even if its not accurate it stil increased by 2? so regardless it improved. Also i understand i havent had them on long but im seeing a consistant reading which also isnt going to change unless i drive harder.
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The DIC is horrible. You need to figure it by hand. I look at both and the DIC is very inconstant. I have been looking at them for 20,000 miles. Not trying to start a pissing match. I love how the borlas sound.
 
i understand. i assume the way the dic is which would be callobrated in some way, its still going to find the avarage the same way. i dont find it hard to beileve that how well the mufflers flow compared to stock that i would get better mileage. Im not trying to argue, i just think regardless of how it calculates it improved.
 
While I agree the mufflers flow OK for 300ish WHP in our cars, the Resonator is not nearly as free, and I'd recommend removing, or swapping it, But......... If you wanna make an argument against the stock cat back, it doesn't flow well enough to get the max benefit of a 3in DP, or headers, the stock flows adequately, but once your past 250whp, adequate isn't what were looking for
 
You do realize...especially on a top swapped car how easy it is to throw down 250WHP right? It is dyno proven and tested the stock catback has no flowing issues until the 350-ish WHP mark. Saying the resonator isn't free flowing? The resonator just cuts drone and rasp...it does nothing to rob HP ratings, or flow ratings for that matter.
 


my car wrasps a bit when i rev it in park, but i love the way it sounds goin down the road. IMO that's what really counts. i don't normally sit in parking lots revving my motor for fun....
 
Get the $1100+ dollar Corsa Catback kit. Will make your car way faster...

Not really but, in all seriousness I don't think anyone has the expensive kit on there GP to say anything about it sound wise... Pony up!
 
pontiackid said:
Get the $1100+ dollar Corsa Catback kit. Will make your car way faster...

Not really but, in all seriousness I don't think anyone has the expensive kit on there GP to say anything about it sound wise... Pony up!
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why would i spend money on an exhaust i don't think sounds good? i drive this car every day, and it runs no exhaust at the track. so why deal with ****ty GP exhaust tones on the street if i don't have to?

bluegtp91 said:
You do realize...especially on a top swapped car how easy it is to throw down 250WHP right? It is dyno proven and tested the stock catback has no flowing issues until the 350-ish WHP mark. Saying the resonator isn't free flowing? The resonator just cuts drone and rasp...it does nothing to rob HP ratings, or flow ratings for that matter.
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any muffler or resonator will cause worse flow than with out them. the turbulence caused in the exhaust flow will slow it down.
 
chunky said:
why would i spend money on an exhaust i don't think sounds good? i drive this car every day, and it runs no exhaust at the track. so why deal with ****ty GP exhaust tones on the street if i don't have to?
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The Corsa exhaust was a joke I'm sure.


chunky said:
any muffler or resonator will cause worse flow than with out them. the turbulence caused in the exhaust flow will slow it down.
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So just put a dump on it then. The resonator's or glasspacks do nothing to harm exhaust flow. Don't know where you get your information from but all they do is quiet down the exhaust. Like I said if your worried about obstructions in the exhaust system that really doesn't hurt it...then just dump it. I'm sure that your not even making near 350 FWHP...so the stock resonator/catback/mufflers/Y-Pipe...etc...has been dyno proven to not have any flow issues.
 
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