Backfire during high rpm shifts?
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Well i just recently replaced the opti and a bad fuel pump at the same time
After doin that ive noticed a backfire or cracking/popping sound when shifting at high rpms. It happens as soon as i press the cluch down to shift. It also does it when free reving in neutral. Its always been a little "poppy" because of the borla being completely open but it hasn't been doing it when shifting until now. Just a little confused because its running great otherwise. Any thoughts?
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