Installed MHD stage 1 on the GF's 08 535 xiT, she's very happy with it, but I'll be upgrading to stage 2 soon since I've got a 7" VRSF IC waiting to be installed. Definitely made a huge difference though. I asked them over IM about getting some S63 love and they said no :/ That's cool they're looking into the S63TU though
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'10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2"
'98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's
'97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's