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My car seems to be running crap since having the exhuast installed. Idle seems to stay at about 550rpm but the cars feels like its vibrating and if i give it the boot and get to 4000rpm it kinda loses power and when i take the foot off sometimes it will stick on 4000rpm for a second or two then...

Hey guys new guy here. just fitted an afm twin exhaust to my omega. Sounds good not to loud just a sporty mild note. Do you need to tune these after fitting the afm twin exhaust or will it tune itself?