James - drive pressure went down to 60psi max after the 369 went in, not sure if that tells you anything else... I suppose the stock turbo may have been gummed up? It's still sitting on the floor in my shop.
The injectors were stock but I had a 10mm cp3 and transmission before I installed the s475/stock kit. Also had a billet wheel from SDP on the 475.
Rough history of the truck and tuning purchased May of 2012 400 miles on the clock.
700miles DPF delete and HS tuning and lift pump/sump
60k miles PPEI tuning
65k miles EGR delete 10mm CP3 install
69k transmission
Not sure when I put in the s475 but I'd say roughly 78k
98k s369, 40% over injector, manifolds/ups, head studs and new gaskets
Just got a call from Josh at Jags and he said it looks like a cracked piston, it's on the schedule for start of next week. He's pretty proud of these LML blocks from past experiences and doesn't seem to have a problem standing behind a 2yr warranty with its current setup so I guess I'm going to have them rebuild "mild build" then run it for 2 more years before I look at selling it.