I can verify now just how well the MM J Line works.
Street, tuning runs, 70+ weather, 5200 ft elevation, Modded stock turbo, IC sealed so nearly all the air has to go through instead of around it.
3rd gear 30MPH to 6800, 4th gear to 5800, shut off early due to traffic, top temp logged was under 80 degrees after many many runs.
Track, MMP, outer loop, fast track layout, 130MPH at the end of the main straight from 3rd to 4th to 5th gear, end of 20-25 minute sessions or going all out, same weather as above, 5,000 altitude, top temp on one run was 114 or so, mostly stayed in the 80+ range except the one long run each lap.
I was making just under 24PSI on the modded turbo, it was detuned a bit for the track as final tuning was not finished yet.
I have no doubt it will handle hot track days, not many tracks have a 7/8th mile long straight you have to pull three gears through.