i have a jackson racing high flow cat, putting out into a greddy evo exhaust on my 2000 si, bought the JR cat about a year ago, at first it was fine, sounded great which it should since they are about 250$ but anyway for the past few months the exhaust sounds like it's been rattleing so im thinking on going with a test pipe, i already have a cel eliminator because that even poped up with the JR high flow, so anyone own a test pipe, which is better skunk, invidia, omni, personaly like the invidia b/c of price but hows the quality, even thought its jus a pipe with to flangs welded on it? keep in mind The car is also soon to be turbo, just waiting on the shop. any suggestions ?