1- Is it a catback mac or the x/h pipe?I have a magnaflow cat back,and it sounded pretty good,but still muffled.So i put a mac off road x pipe on the car,and it really shined.The sound is AWESOME.I know that people have troubles fitting mac products,and i had too,but nothing you can't work around.But as far as sound i say it's great.Performance wise you should see about the same with all the aftermarket parts though.Also the mac has a new design that seems to be exclusive to them.And that's they're pro chamber.It's not an x nor an h pipe,but a chamber connecting all the pipes.
2- X pipe are louder and make more power on the top end.H pipes are quieter,and make more power in the lower end.I'm not sure if that is totally true,but that's what i think the differences are having read alot of these threads.
3- A k&n filter usually goes into the stock box of your air filter,and is not stock.The stock filter is white.I would leave it in because there's no need to replace something that get's the job done good enough.
4- Use the search please.There's just too many things to list.I posted a huge list of things a long time ago with pictures and links to sites where you can find those things,but i can't find the thread any more.Anyway,just use the search.
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