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Shot in the dark here but is your trunk oem? 6 months into having my car I went catless and noticed a strong cabin smell on acceleration and deceleration. Switched back to stock exhaust and still noticed it a bit but not as strong. Car sat at the dealer for a month with them trying to figure it out (had a warranty on the car at the time). Turns out my aftermarket CSL trunk was the issue. It was vacuuming exhaust fumes and filling my cabin, the trunk had like 7/10 fitment. Switched my trunk to oem and never had the same issue.
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