Hellcat 426 stroker. It is struggling in the high rpm range. I have a dual livernois fuel pump, boost a pump, 1300ix injectors. With a 10 percent lower and 2.65 upper it is only seeing 15 psi. It has a modern muscle ported throttle body. The engine builder thinks it is the throttle body. The tuner thinks maybe the stock supercharger is just too small for the stroker. It was tuned with Diablo. The car has 3.09s and a slightly shorter tire than stock. It was done in 5th. It should of been done in 6th gear. Automatic. Next week my friend is going to put it on the dyno and scan it with hp tuners.