Well, I think we found the limit on our entry level kit with the 4854. We through on a MBC last night and played around with a few different settings. This turbo however just seems to run out of steam around the low 300whp mark. Even turning it up to 15psi, we did see a big torque jump, but only gained a couple of ponies. We decided that the car/turbo was happiest around 11-12psi. So that is where the car sits for now. I am sure we could squeeze out some more with E85, but we wanted to push it on 93 for now. So I still think this is a great set up for anyone wanting that 280-300whp range. Honestly, at this power, the car is perfect. Still easy to drive, predictable, and not annoying, so it is still fun as a DD. Otherwise, I would really step up to the 5858. I would bet we could make 330whp+ with much lower boost levels. That will come soon.