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Bootmod3 has the Stage 1 released at the moment. Need a computer or the wifi client with the iOS app. I just use the computer as it's quick and easy since I don't need to monitor the gauges. I'm running the beta Stage 2 and it's phenomenal. Highly recommend.
I'm running the K&N drop in filter and VRSF catless downpipe for the Supra (both fit exactly the same on the m40i and supra) and have had zero issues. I do need to adjust the downpipe as it isn't sealing all the way at the turbo. I get exhaust fumes sometimes through the air vents if I have it set to fresh air instead of recirculate.
Most of the performance modifications for the Supra will work on the Z4 since the drivetrains are essentially identical. The Supra did use a slightly smaller turbo and fuel pump, but the flange on the turbo is still 5" on both supra and z4.
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