Tim is absolutely spot on,
from my experience and in my opinion
CAI, no need to go and waste your money on a branded kit, do a search "two hole mod" this is bascially cutting a second hole in the base of your airbox- found it works best.
Headers, I use and recommend pacemakers. I havent used any other brand.
Cats, basically there is 2 different types, metal and ceramic.
cats will change the way your exhaust sounds but be carefull cos sometimes your exhaust may sound worse if you want more flow, but flow is better for the engine in high rpm, metal highflow cats cats are usually 200CPI (cells per inch), and ceramic highflow cats are abour 300CPI - less cells = more flow.
Exhaust, a catback exhaust is really only for the sound, if your expecting noticeable performance gains on the street then you will be dissapointed. when my car was CAI and tune only, i was running with ceramic highflow cats and lukey twin to single 2.5" system, this worked well.
then i upgraded to the X-force full 2.5'' stainless catback system, in my opinion this is a better sounding exhaust.
Supercharger, JUST DO IT
if anyone can find some NGK LTR7AP 11 plugs id love them
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