I am just wondering what would be the best first mod horsepower wise; cat back, cams, CAI? Any help would be appreciated.
i'll second that list. Most people will go for the intake, which IMO is the best "first" mod to go with. If you've never modded a focus before, the "umph" you feel after the intake is on will make your mouth drop (atleast mine did).The normal Set up ususususuusalllly goes as follows
Intake, Exhaust(full or not), Suspension, then usually a chip.