I have on 06 wrx, my setup now is vf39, ebay topmount, turboxs exhaust, gruppe-s headers, and scott siegal protuned. car is fast, but im bored now, have had this setup over a year now. Was thinking about front mount, spt intake, and alky injection,and larger injectors, then a retune. Should I yield a good power increase with this setup over my other. Is it worth it to do it on the vf39?? I would like to keep the 39 and get as much out of it as possible. I ran a 12.5 @ 107 so its a quick setup, just want a lil more.