i think a header is very worth it for the power increase, smooth idle, over all punch, sound, smooth everything etc!! however mine was used for $250 and only a week or 2 old. i was pissed Perrin lied about the reason the owner returned it though but simple mod and its 100%. no cracks yet at about 20k but i have a welder so its not a big deal if it does! in 200k it might look like Frankensteins face though. im 10% the way there.
o and ya stay out of boost. i am one of the few that run parts for a week or so before a tune because im testing for problems and install doesnt always happen in one night the day before a tune.
Scott-2011 WRX 335HP 394TQ 93 VF52!