I may not have been clear in my description, sorry. The car is shifting beautiful. Its quick, firm, & crisp in every gear. It is 10 times better than...
I'm currently working on a 2013 Sierra (NNBS) and using a "525" aka F90000285 pump. Those pumps are designed to run PWM so there is zero issue there....
I have a 2005 GTx supurcharged it will only run about 35mph I took it to a shop and was toold that is has alot of code but not anything specific did...
Haha yeah thats pretty wild. Dont know why any of the factory fuel system would be left on a 1300hp car. Strange that rails seem to be regularly left...