Pontiac GTO 2004-2006 - LT's with stock exhaust?




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HAUS1
06-30-2005, 06:35 PM
I know that longtubes do add a good deal of power. How much of a gain could you see with longtubes and the stock catback, for noise purposes? Would it be worth the gain/ noise level or would it be a waste of time?
Sorry but I am not too familiar with the catback on the GTO's...
Jon


BlueSix
06-30-2005, 07:36 PM
You'll see a noticeable gain even if you run the stock catback.

99CamaroSS_
06-30-2005, 08:04 PM
the stock catback on the 05 gtos are considerably good, i plan on keeping the stock catback and replacing with LTs and hi flow cats. You should see a 20-25rwhp gain for LTs and Cats, with the Stock catback. Ive heard people switching to other catbacks and only gaining 5-7rwhp over stock.


HAUS1
06-30-2005, 09:18 PM
Well that is good to know. It would be much nicer to throw some nice longutbes on while keeping the stock catback for sound.
Jon

Dbluegoat
07-01-2005, 09:13 AM
yeah the sound is improved.....the stock catbacks are just not worth it unless you only want the sound. I have yet to see someone gain anything over 10hp for some of these $600-700 catbacks.

I have longtubes with cutouts and stock exhaust out back.

Rob
07-01-2005, 02:18 PM
Long tubes with cats and stock cat back....sounds great. I had the H-Pipe made functional and it quieted it down to almost stock levels. Stealthy :D

1MEANGTO
07-07-2005, 04:21 PM
My car is very loud with stock cat back and lt's and they we're worth the money.