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I had this issue while running the BW Xpipe, Gintani Race rear, Alpine stage 2 tune, MT. Immediately fely a loss in power in that rpm range. It was VERY noticeable when trying to accelerate hard in 3rd or 4th gear from under 2500K. The car would start bogging down, if I backed off the throttle I would be able to get through it. If I held on the throttle, it would bog so hard that it would send my car into limp mode. I would have to pull over and restart the car to get going again. I read the other ongoing threads and some people were pointing towards the tune so I flashed back to my stock tune.....no go. Because I spend most of my time in stop and go traffic I kind off need the low end. Swapped to a MS Xpipe where the X is farther back and viola, problem gone. For me, this issue seems like it was fully related to the X placement.
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