most common first three mods are I/H/E

intake, header, exhaust

personally, alot of that other stuff i wouldnt have went with, provides nothing but hassles. but to each his own

since you already have a intake, look at either a header or exhaust. if your going exhaust, let me recommend the apexi WS2. its not some big obnoxious fart can, but it sounds nice, and keeps unwanted attention away as your driving down the road