I was wondering if you guys have any input on this---I have been running lean at hard load on my car(02 guage) and couldn't see why--since I have a crazy big fuel pump--Bosch pump from a porsche that has 250 stock HP, and a stock BB setup--t25, 370's. The only change is a front mount intercooler. I was only running 8psi, but I tried running more and it definitely couldn't take it. So today I installed my DIY adjustable fuel pressure regulator(THANK YOU CHARLIE2020 for the insight!) and upped the pressure to 58 psi and now no lean condition. I don't see why I shouldn't have been able to run 3 bar until I was over 230 or so WHP. What gives?