intake and exhaust

[jinhsuh]

which combination of intake and exhaust would produce the most hp and produce the best sound for a 2.5?

[johnny_d]

let us know when you figured it out

[desertdragon]

It's called trial and error. I don't think anybody can give you the exact answer. You have to do your home work, search and research...

I am not being an @$$, just stating the facts.

[mcheddadi]

Injen + Greddy ti-c

[adidas2go]

Go with well know names and they will all give you roughly the same increases

[SHIFT_COUPE]

Most will give roughly the same increases IMO. Shop around for appearance, sound etc also.