Measured the OEM exhaust for the heck of it, the midpipe is 2.1" approx
eBay Y pipe I got is 2.5" to 3", which can still be a restriction for a turbo car so might switch to an H pipe that's 2.5" all around
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning