I was wondering if you could modify the fuel system on Gulf Spec LS460 to get the 380hp instead of 342 or if there is any modifications out there that could add the extra power.

Thanks

 

if its the same prob as the gulf spec is300, then no. due to our regions oil's sulpher content we only have port injection while JDm and US spec have both port and direct injection resulting in that extra 40 hp. i didnt look this up or anything im jsut assuming as thats the prob with my is300 motor compared to the isx50 in the states/japan. want more power? TOMS and or WALD should be making a supercharger for you car