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09-13-2005, 05:45 PM
| #1 |
| STI Master Car: 04 Subaru WRX STi Fav Mod: Whooshing sounds Location: Death Valley Posts: 6,233
IWSTI Addict since: Nov 2003 Trader Rating: (11)   |  Questions about downpipe/catback I want to learn more about the different exhaust modifications for my STi, may do some in the future. I know the stock unit has 2 cats, I did some research and most catted downpipes seem to have 1 cat. Can you still pass smog with it? (I'm in CA) 2. Is it ok to have the downpipe installed without tuning? Any risks? 3. Will a catback piece significantly make more power with a downpipe or just a lil more? 4. What about the up-pipe, is that worth replacing at all? Anything else you can educate me with is welcomed. This ad is not endorsed by this member. Please register or login to hide this ad. |
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09-13-2005, 05:50 PM
| #2 |
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09-13-2005, 07:33 PM
| #3 | |
| STI Master Car: 04 Subaru WRX STi Fav Mod: Whooshing sounds Location: Death Valley Posts: 6,233
IWSTI Addict since: Nov 2003 Trader Rating: (11) | Quote:
You da man! Thank you! This ad is not endorsed by this member. Please register or login to hide this ad. | |
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