Marine inj without reflash is same performance as stock, the IP has to ask for more fuel, 99% of people will not see anything with MI's alone, now once you reflash whole nother story. Yo don't need new turbo or lowered CR unless really pishing the envelope, you've got to set up the truck however to handle extra heat rejection required when going for performance.

How deep is your wallet & how strong the desire to go fast?