Question on Downpipes
#2
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One with a cat converter has a catalytic converter and will keep you street legal. One without a catalytic converter will run a little better, but is not street legal. Unless you have a programmer, you will have a check engine light and you will fail you state emmissions test if they have them. More importantly, if you get one without and have a warranty issue, they will use that against you.
#6
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than i guess its a no brainer. but how much do you think it does for you having the one without it, and i already have the GM performance exhaust. will i notice a sound difference or performance gain
#7
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a d/p without is like 150 i think and one with is around 250 i could be wrong but thats what i think they cost and you will probably gain like 2-4 hp and the sound will be a little different
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#12
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it will get louder, and with some rasp. I have the vibrant exhaust and put a dp with out a cat and made it twice as loud. I plan on getting a resonator to get rid of the rasp
#13
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I put on the XTC 2.5" downpipe w/cat after I had on the GMPP sport exhaust, exhaust manifold, and intake, and I noticed a big difference in tone and a bit in power (although I haven't been over 3500RPM yet, only 50mi). I can actually hear my car idling now!! And with all the nasty bends, the stock DP gets down to 2", so I would give the XTC a bit more credit on hp, maybe more like 6-8hp. You have to remember, a high flow cat flows about 95% as a straight pipe the same diameter.
No probs w/ fitment, and no CEL.
No probs w/ fitment, and no CEL.
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#18
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Straight up easy. No pushing or pulling, once the manifold bolts were on, the exhaust bolts just lined up. Absolutely ZERO problems. I have a "How-To" being approved right now, showing the whole process. I'll post a link when its done.
#19
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