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I recently posted about this same issue in several places and I'm currently talking to Randy from Epic to see if he has some feedback.
My setup is BW x, Dinan exhaust, bpm stage 2 tune. I noticed a big drop in low end torque/response and a terrible rasp around 2k-2.6k rpm immediately after installing it. Wonder if the rasp is proof of this exhaust gas pulse interference since it seems to happen at the same time?
My car doesn't quite bog down or stutters as some of the videos I've seen, but there definitely is a noticeable lack of response as compared to my old TopSpeed x pipe.
I'm not sure if I've gotten used to it or if it has improved over the last 1300 or so miles as the Ecu adjusted, but it feels a better than it did immediately after install.
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