I kept my ST stock last year and did a few autocross events and a couple of track days. One of the highlights of 2013 was passing my father-in-law on the front straight at Summit Point in my stock Focus ST with him in his 580 HP Camaro ZL1. I know that starting with the modifications just bumped me out of GS and into STX for autocross, but I'm just out there to have fun. The Roush intake was my first major mod. I have a COBB rear sway, a CP-E rmm, and Carbotech AX6 brake pads arriving in the mail soon. The Roush intake install was not too difficult. I took before and after videos for anyone who is deciding on a CAI and curious with how the Roush intake will change the sound of the turbo.