[KingLT1]

The XDI +65's and 30's work really well. The +30's require very little tuning. The +65's require going through the rail pressure table and lowering pressure in the idle tip/in cells until you get injector Ms to .8 or higher. Then they drive like stock.

+32 cam paired with the LPE DI pump won't allow you to fully utilize the XDI +65's.

My brothers C7Z made 901whp on a Mustang Dyno @ 15psi on E62. He went down from a 80mm to a 76mm pulley on his 2650 and now fueling is maxed @ E60. I have rail turned down as low as you can go (2175psi) to keep pressure consistent.

As Josh said you really need a +43 cam to take full advantage of the big injectors but as you can see even a +32 cam will still provide enough fuel to make well into the 900's on E60.

Far as FIC injectors. I have tuned a couple sets. One set would misfire @ LT4 pressure (2900psi) the other set wouldn't. Turned down they worked great. Bigger injectors don't really need to run LT4 pressure and you take some strain off the high and low side by doing so.