just make sure u get a reputable brand, i like Zex, its safer from my point of view, cuz i know many more people with them, and their engines are fine. I would get a smaller kit, like around 55 shots or less. honestly, ZEX is pretty safe, get the whole kit, which comes with that safety management crap i heard you get. if u think about it, almost everything has the POTENTIAL to hurt your car, in terms of performance mods, at least if you do it wrong. if you get just the exhaust, without getting an intake and exhaust manifold, many mechanics told me that can hurt the life of your catalytic converter. is that tru, im not sure tho... but what i am sure of, is if u install things wrong, cuz of mods, or get a cheap brand, or never clean things such as your intake filter. if u drive your car normal, like not playing with ur transmission like its a manual, or push your car like a maniac around every turn in school and in public, ur car should be fine. its all about how u treat and maintain ur car. btw, u better beat this prelude, i kno u can beat it. V6 accord vs an auto, i have friends with both 5 speeds in the SH and non SH as well as one's with auto's, and let me tell u, there is a difference, i think much bigger difference than in 4 cylinder accords with autos and manuals. i dont care what he has on this prelude, u should beat it. unless he secretly is bringing nitrous as well, he has no cat, with all the bolt ons and Nitrous, ouch, u may lose than. so bring the ZEX with u, and take home the $$$.