who does 2.5
#1
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who does 2.5
whats a good 2.5 lsj cat back and down pipe i really like the zzp one but they dont have a 2.5 cat back idk why? i dont want megen and i would love corsa but way to expensive and no custum
#5
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I agree big power has been made with just the stock exhaust. But I would say a catback isnt just for sound. Remember back in the day JonyyB doing a before and after with stock and GMPP exhaust? He made 12hp with the GMPP. And it's a smaller diameter than stock. Go figure haha. Oh I found the thread.
https://www.cobaltss.net/forums/show...P+exhaust+dyno
https://www.cobaltss.net/forums/show...P+exhaust+dyno
#7
There are restrictions in the stock catback that most don't know about....
The inlet to the resonator is only 2 1/16" i.d. & the muffler is not a straight through design.
That's why people gain "some" horsepower from catbacks on the SS/SC.
The SS/TC has a very good catback from the factory:
- 2.75" inlet to the resonator
- full 2.5" piping
- straight through design muffler
The inlet to the resonator is only 2 1/16" i.d. & the muffler is not a straight through design.
That's why people gain "some" horsepower from catbacks on the SS/SC.
The SS/TC has a very good catback from the factory:
- 2.75" inlet to the resonator
- full 2.5" piping
- straight through design muffler
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so the gmpp cat back i also need a down pipe due to a cracked flex pipe iam looking at the zzp 2.5 catted will that match up with that gmpp what other good DP's are out there
#23
I found a guy selling just a muffler from the GMPP touring catback.
I had it welded on to the stock catback, and it sounded great!
I still like my Corsa setup better though.
Agreed!
Last edited by Staged07SS; 11-18-2011 at 10:21 AM. Reason: Automerged Doublepost
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#25
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well i ant really looking for hp gains i want a good sound i need a down pipe 2.5 form zzp and a 2.5 cat back but i dont have a clue where to get one corsa is to much along with the gmpp i think iam better off going costum