Right starting with the Airfilters first
Have a read of my BIG induction thread by clicking on the link in BLUE under my signature at the bottom of the post.
Then deside what budget you have, as that will determine what filter you go for.
Will you feel a differance . . .
Well YES, well sort of - If you drive like a girl (sorry) and keep the revs under say 4k then . . . NO you wont see much gain apart from a bit more noise.
But under very hard accelration and when the revs are over 4k then against a standard setup you will see a more free reving eninge.
Dont expect a airfilter to turn your car into a Evo9 but it will make a better noise and go abit faster.
All tuning should be seen as steps, one step leads to the next step etc, a induction kit will compliment a sports exhaust, which will compliment a 4branch manifold, which will compliment a decat and so on.
Try and find out as much information about the parts open to you when looking to buy as what you can afford one month maybe ok but after two months you could have had something alot better
