The TRX's have a different front drive setup, you'll want to study both to see what works for you - with a tube K I'm guessing either works. If I was doing a non oem K I would definitely do one that let me use the oem oil pan. That's ~$500 you don't need to spend if you're already bucks out on the K. Truck manifolds are just straight back logs pretty much like the 5.7 truck manifolds. I would think they fit and still make 710hp. Car ones might fit with rack and pinion.