I"m lookin to put some performance mods on my WRX but dont wanna kill the warranty or engine/turbo. Which kind of header,uppipe,downpipe,exhaust system should i get for the BEST performance. money isnt an object. I heard the intake is pointless to get but anyone know actual increases with them and which is the best. I also plan on gettin a AEM pulley kit unless sumone knows better. what about apexi BOV or is there better? everyone help me!!! PM ME i dont go on forums much

 

Uppipe, catback, and ECU reflash like Cobb will give you great results without doing anything bad. You might have to swap the uppipe back out if you ever needed powertrain work, but probably not. Pulleys are fine, but I'd highly recommend sticking with lightened rather than underdrive. The extra 1-2 hp isn't worth the problems they cause with alternators and power steering pumps.