well, my midpipe has a leak in it right now. so if i were to replace it, i'd rather get something better. really, only a 1 hp gain with a testpipe? i thought that it actually made a noticeable difference in turbo charged cars. not alot, but more so than say a K&N air filter, right? if i get a free-flow cat, i still need to replace the piping right? what do you guys think? and what are the price comparisons. thanks.