Originally Posted by nossliw

Is your EBP on gauge or Absolute pressure reading. I did not see a map reading throughout your tables, or did I completely glaze over that? If that is absolute, then its pretty low IMO. 90 mph with 4.10s...eeek! I'd start with your injectors and do a compression test before you go any further, the compression test and a leak down test are the best tools to verify the motor is worth a chit before tossing a ton of money into parts that in the long run will only be minimal increases. With 4.10s towing 8-10k bone stock is not a problem for these trucks, our logging trucks yank 10k lb chippers daily without issue. At most they have an open exhaust and 6637. Boost check the system to a gauge read 30 psi, including the turbo with the CCV inlet plugged.