hv3 does nothing for low end, actually if you go on zzp youll see you lose some down low with it also under 4000 rpms(not much but its true), headers you just move the "powerband" in the upper rpms not in the midrange rpms power anymore, goes good with hv3 and tune. if you want to keep your midrange power get a plog and 2.5 inch downpipe.
this video is dmahlikgt 0-90 video of his n/a http://www.youtube.com/watch?v=O5KED...zS6JCGemFDBFPw= he has everything but a tune.