were is it getting tuned lido, he had my buddy use a fmu, thats probally why the fuel system isnt good enough since it cant handle the huge psi that fmu is going to produce. What size is the spacer I got one thats about 1 inch and 1.5 inch that are from my old procharger, whats your fuel setup iam fine with a 255 inlank and inline no fmu 42 lbers and 463to the wheels at 6400 iam sure its over 500whp at 7k and iam fine no problems at all. I will come get that bitch together by the downriver cruise if I have to lol.