seriously, when you take a stock pipe, and take the cat off it. thats bad. if you do other things to replace the cat its not that bad for it. but engines do need back pressure, otherwise you will be burning out valves in a matter of thousands of miles.  Trust me, ive been through it, and i know what im talking about.  Why do you think that engines have exhausts at all, its not just for noise reduction, but its because you cant have your exhaust flowing freely out of your engine, it needs some back pressure, not tons, but some. A catalytic canvertor does serve the purpose of claner emissions, but it also creates back pressure.  There are many things in cars to make cleaner emissions, like egr valves, but thats not all. IM saying that you cant have no back pressure, or else you will lose a lot of power and its bad for it.  Some people just throw 15 dollar cherry bomb peices of shit on their trucks and call it good, whick couldnt be further from the truth, plus they sound like shit.  Trucks are not where its at, i heard a 69 camaro in here, if you build the 302's right, you can hit 11 grand. that is if its not a z
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i hate posers. thanx to harvey and all who contribute to the site for makin it so kick ass.
if people dont like what ive created, fuck em, because somebody else does-TANNER
can you see what's down there? me either.-seth peering down a cliff before he drops it