i have an 04 sti with a helix downpipe and blitz cat back i am wondering if anyone you have this problem when im WOT 4th 5th 6th gear my engine seems to cut out for a split sec on those gears at about 6000rpm and make my check engine light turn on anyone have this problem and if so what did u do to make it stop

 

well your experiencing boost creep... same thing happened to me. the check engine light would stay on for a while then for some reason my cruise control light would keep flashing.... buuut as soon as i got my accessport and swaped maps all the lights were turned off and i havent experienced boost creep since