i installed a used gruppe-s uel length header on my 02 wrx today and the car now idles rough. i also installed an accesport stage 2 map with the install. i ran before the relash and the idle was rough then as well.

info the car has a catless 3 inch dp, borla hush, helix uppipe, now the header and stage2 map.

anyone experienced this issue or similar? advise...?

 

wens the last time of the tune up? pretty weird