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Not to thread jack here, but your gas mileage got worse with a free-flowing exhaust? That's odd...if anything it should get better, but usually the effect is very small. Maybe it was how you were driving it in order to hear the new exhaust?
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2017 F-type SVR Black/black
2017 Nissan GTR Red/black
2022 BMW X5M MBB/SO
Gone but not forgotten: '12 X5M, '07 AM SuperVantage, '05 Boxster S, '01 BMW M3,...
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