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Are you absolutely sure there are no exhaust leaks from the header or overpipe install? Or the intake fiddling? If not, was the car tuned for the headers & overpipe?
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2020 GMC Canyon Denali Duramax, 2021 Forester Sport, 2000 Subaru Legacy B4 RSK 5MT (JDM Import) and random 86 chassis rebuilds....
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