Just had a friend buy this kit and install it himself and I ended up tuning it.
Honestly a great kit out of the box for someone who wants to use E85 otherwise you'll need to add a wastegate to the chargepipe coming out of the blower so you can limit boost.
Using the BOV and a mac valve sucks and it's not the proper way.
Aside from that, the newest kit (received a few weeks ago) only makes about 14~ psi uptop with the bumper on. That translates to around 550whp on 93 with really high EGTs and a little over 600whp on E85. Taking off the front bumper will raise boost by about 2-3 psi and add another 20-30 whp.
One big concern I saw is that installing the kit without modifying the front bumper to increase the airflow will make the engine overheat. We got the car to get to 230F coolant temps doing a 0-120 mph pull. Coolant is bled properly and there's no issues there. If you remove the bumper, the temps stay at a constant 190F which indiciates that there's way too much heat being generated.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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