I was tuned on 91/E85 a few months ago but never got around to doing a review. Obviously at 28 PSI I've had to ziptie a few vacuum hoses, but whenever I have everything connected correctly the driveability is excellent. Steep uphill starting and parking is honestly easier than it was in my old stock IX SE.
Also, I'm making 1 more WHP on their dyno than a stock R35 GTR, so my life is basically complete. I'm done.
IX GSR, Kelford 272s and springs/retainers + studs, CBRD BBK-B BB, ETS intercooler, ETS LICP and UICP, 1200cc injectors. Limiting factor right now is the Walbro 255. On the dyno it was still going strong past 400whp but they dialed it down to keep it safe and conservative. WOT daily for 4 months now, 83k miles.