LT's with stock exhaust? - LS1TECH

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Pontiac GTO 2004-2006 The Modern Goat

LT's with stock exhaust?

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Old 06-30-2005, 06:35 PM   #1
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Default LT's with stock exhaust?

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...
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Old 06-30-2005, 07:36 PM   #2
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You'll see a noticeable gain even if you run the stock catback.
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Old 06-30-2005, 08:04 PM   #3
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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.
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Old 06-30-2005, 09:18 PM   #4
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Well that is good to know. It would be much nicer to throw some nice longutbes on while keeping the stock catback for sound.
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Old 07-01-2005, 09:13 AM   #5
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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.
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Old 07-01-2005, 02:18 PM   #6
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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
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Old 07-07-2005, 04:21 PM   #7
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My car is very loud with stock cat back and lt's and they we're worth the money.
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