I have a 06 STI was curious as to what everyone thought which air intake system performs the best?

 

I feel non of the intake systems really help much.

For the cost of an intake, buy an panel filter and get an up pipe. You'll feel the difference.

 

well i got an 06 sti too, the K&N Crinkle Red Intake for WRX & STi is good, but i would'nt suggest it if thats going to be your first mod. the factory intake performs just as great especially with a drop in filter. as for me, the route i took was opening up the turbo. i got the a blitz nur spec R cat-back, perrin downpipe, and cobb accessport. the power difference is huge from stock. anyways, i'm getting a perrin short ram intake because i'm going with the perrin front mount intercooler. well good luck on what you choose...

 

...no need to replace the U/P, it's catless already. Maybe so if you're gonna go EWG with a bigger snail or the shields start to rattle.