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I have a catted valvetronic xpipe with a forward X that is said to experience the same issue, installed on a 6MT and a stage 2 bpm tune. I could ascertain a torque dip coming out of a stop under moderate acceleration when it first went onto the car, but it quickly disappeared. The sensation was similar to waiting on old turbos to spool. I assume that the car’s adaptations adjusted to the equipment. Car pulls linearly now.
I don’t like this particular X, however, because the cats hang down too far and I can rub on speed bumps. The car isn’t lowered much at all. I digress.
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