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Had this happen in my old classic, which I thought was coming from the rear of the car, found out it was a leaky injector one of the O rings had split on the injector, but the smell at the back of the car was worse than sitting in the front for some reason, might be worth looking at.
the car also doesnt seem to feel as fast as it did before even though its boosting fine. i have an apexi avc-r installed, would it be possible to check if the injectors are okay through the injector duty on the avc-r?