What problems are you encountering with your injectors? At 18 psi I would assume that those #'s should be much higher...42# injectors? What turbo and a/r are you running? Blow through or draw though MAF set-up? Did you take on tuning yourself? Wow, 400 whp on a stock converter...that's something. Try a level 10 converter, some torque gain to add to your dyno sheet. Were those numbers achieved on pump gas? Is that a fully built motor or are you on stock internals? Compression ratio/stock headgasket? Yeah, I know....a lot of questions, but I'm just curious.