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Would I benefit from a 3" exhaust

BlackandSilverGTP

BlackandSilverGTP

New member
Just like the thread states. Im curious if anyone knows if i would benefit from a 3" exhaust or not with the mods i have listed in my sig over the 2.5" i have now.
 


i have a 3" TOG down pipe with no cat from zzp. the previous exhaust sounded better without a cat so im kinda kicking myself for adding a magnaflow cat to the one i have now.
 


More like 300...or close to that...the best M90 build I think just cracked 400...and it was using a big cam and heads.
 
youll gain absolutely zero power. if you wanted to gain that 2 crank hp back just drop the catback at the track.
 
seeing its a larger exhaust and i wont gain anything by it would there be a possibility of power loss. im not really looking to gain any power, i was just curious if it would. the exhaust i have now which only part of it is the R.A.T. system. its been a problem since i bought the car from the previous owner and the sound is just crap. if it could hurt the car i wont go that route and may have to sell the down pipe. :(
 
Apparentely these cars need a little bit of back pressure maybe if they were turbo I would go 3', but just change the tips and spend your money elsewhere.
 


ls6velless454 said:
Apparentely these cars need a little bit of back pressure maybe if they were turbo I would go 3', but just change the tips and spend your money elsewhere.
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i tried that..it still sounds like crap. i need to replace the whole exhaust anyways seeing its back hacked up so many times from repairs. the monza system is supposed to have low back pressure. here is the link to it where i found it Monza 88-1484 Pontiac Grand Prix Cat-Back Exhaust - GP GTP
 
i've got magna flow glass packs on it now but they have seen better days. the car used to give off a nice deep tone almost like a muscle car but over the years the pipes underneath started to rust and had to be replaced and the shop that did it is no longer around but they used a smaller pipe than what was on it when i took it to them.
 
Although I'm no authority on these v-6 engines, I would guess at no power loss running through a 3", but probably torque loss because of lower back pressure.

I've never heard a v-6 with an aftermarket exhaust that sounded good to my ears. I'm "old school, though, and was raised around v-8 engines, so that is the standard by which I compare all others.
 
3" youll get no power gain or loss of torque.

its just a waste of money and ends up sounding like crap.
 


well that sucks..i dont have a stock catback seeing it came with a after market one when i bought it. i dont think it can sound any worse than what it does right now. it idles real nice with a deep tone but when you stomp the gas it can sometimes be mistaken for a fart can.
 
thats how GPs with aftermarket catbacks sound, good at idle and retarded with any throttle. you can probably but a glasspack for a resonator and build 2 yourself a cat back
 
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