heyaa Sol again ,, you mean like cams pistons etc. well yes but not many people specialize in Tuneing a Lexus GS400 V8,, and the people that do modify them, only came up with a supercharger and Air intake system whitch is bad because NO ONE made a high preformance Chip for it which allows More Air and Fuel Mixtuer in the engine ,, I know its bad thats why I am thinking of NOS