I put a straight through pipe in place of my resonator, and almost everytime time when rpms go down to idle position, it misses it, and goes down to about 300 rpm,(it seems like it's gonna stall) and then it regains itself to normal 600rpms. i thought its not gonna do it after ecu re-programs itself, but it's been almost 2 days.
any answers appreciated, is this normal? how you guys doing with mufflers or y-pipes?
thnx peace

 

anyone know about this? i am interested aswell...