sup man... my intakes were home made... here is the thread...
http://www.the370z.com/exterior-inte...take-hack.html
i wouldnt invest in the k&n because they dont really have gains to them... and you cant see them
for my roof i just bought vinyl at a local vinyl shop here is the thread
http://www.the370z.com/exterior-inte...ota1s-z-d.html
as for your test pipes... if your buddy is sellin them really cheap then i would grab it... itll sound more raspier and mean.... i actually got my stillen high flo cats before the greddy se... and it felt like it got faster... imagine test pipes... no restrictions at all.. only thing is that it will smell like fuel.... and it will be super loud when u get a cat back...