Thread: stock V8 mufflers on a gtp

Catless DP with the stock catback sounds great IMO. It's louder than stock but still pretty tame, no real rasp either.

flowmaster 40 series DO NOT sound like crap.

removing the resonator is GHEY! That's the reason it rattles like that. Watch, here's mine with headers, 3" dp, thrush glasspack, and 40's mufflers

HPIM4007.flv video by ninnyGTP - Photobucket

*edit* the reason they sound different is Firebirds/Camaros only use a single muffler and that GP had it's resonator removed

Just for comparison, here's my car before and after the glasspack

http://www.youtube.com/user/ninnyGTP#p/u/1/-tCprMiwnww

best sounding 6 (Camaro) I think:

YouTube - V6 Camaro Exhaust vid

The thing that screws us over is the crossover, the F-body guys can have pretty good sounding cars for what they are.

On your dic? Have you filled up multiple times to get a constant reading.

yes, its a good reading. also its all city, not once on the highway. so its not really funny huh blue

Originally Posted by rocafella2032

yes, its a good reading. also its all city, not once on the highway. so its not really funny huh blue

You have had them what a weekThat is not a good reading and you said you are going off the DIC? That is a horrible reading.

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.

Originally Posted by rocafella2032

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.

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.

Originally Posted by rocafella2032

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.

The DIC is a joke, its their to look pretty and that's it. If you want an accurate reading your going to have to do it the old fashion way, with simple math and i very very highly doubt you gained mpg by mufflers.

Hell my DIC shows mpg dropping 1 by 1 when at idle...

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....