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Where is the noise coming from? Is it coming from the back of the car (near your new muffler), or the engine bay (near your turbos)?
Have someone drive near or behind you while you are doing these WOT pulls and maybe you can localize the noise to come up with your answer. The two sources you are suspicious of are pretty far apart in location, so this might be a good place to start.
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E88 Crimson Red Vert MSport 6MT - Listing your mods in your signature is lame.
BMS DCI/MHD E30 Flash!!/AA Sport FMIC/VRSF CP w Tial BOV/VRSF 3" DPs/550i clutch w SPEC SMFW/Apex EC-7s/Whiteline RSFB/E92 M3 FCAs/Bilstein B12 Pro Kit/VRSF inlets |