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running 2 mufflers, 2 resonators, and catless headers and its way too raspy, i want to buy a new axleback with helmholtz chambers but my car has a pop tune, will that destroy them?
i'm running a tsudo midpipe which has an xpipe, so fabricating a hpipe would be fine? also a pop tune wouldnt hurt the hpipe either right?
if it already has the X-pipe you should be fine, just a larger/longer resonator should change the frequency and tone. I would swap back your OEM midpipe and see if that get rid of the rasp.