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Tuning after changing out factory exhaust system to aftermarket on sti

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Ive been searching for anything in particular in tuning adjustments for my sti. Im changing out my stock exhaust for equal length header uppipe and downpipe. I have a cobb accessport and accesstuner software just no real info or what modifications I should make for aftermarket exhaust! Please someone point me in the right direction! Thanks

i just replied on your other post but it will need both fuel and ignition checking generally it will run leaner and need timing removed

I appreciate your fast response. Is there any links you could share on removing timing. New to this but fast learner thanks

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