I have an 09 2.5i with an 09 wrx exhaust, K&N drop-in filter, and a Kartboy SS. I don't drive hard, but I drive alot and I haven't really been happy with this transmission. I've never driven a car that has a clutch with a different engaging point EVERY time u shift. The stock shifter's throws were madd long, so I got the Kartboy SS which feels better. I'm going to grab a stronger clutch and bushing and see what that does. Car has 23,000 miles.