I have a '95 Supra Auto with a T04R Turbo kit, 720 injectors, large intercooler, twin supra fuel pumps, fuel pressure regulator, VPC, AFC-R and EVC 4. The install was performed at Paisleys Shop in NY but I live in MD so I contacted Billy Cha at Altered Atmosphere to get this thing in for a few pulls on the dyno. Since this was my first time on the dyno with the single kit, I was eager to see what kind of HP I was putting down. Once at Altered, Mike (Owner) and his dad got me on the dyno and on the first pull I got 401 HP @ 17 psi boost. WTF! I was beside myself! The car was running very rich so Mike tuned the AFC-R and moved the boost up to 20 where the car made 445 HP a few runs later. 445? What in the hell is going on? My compression is between 150 and 155 on all cylinders and my tranny shifts great so where is my lost HP? The plugs have been in the car since the single install back in June but it looks as if I'm down 100 HP from where I should be. Could plugs make this much of a difference?