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Can someone who own 1996TT share experience specifically after ugrading to turbo-back system. Does "Check Engine" show more offten because of high flow cat? I know after-cat O2 can be tricked out. But for those who keep the after-cat O2, do you run into "Check Engin" more? Currently, I plan on high flow cat upgrade (perhaps, downpipe, too). Thanks all.. (hardly post, but read daily)
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