I just purchased a used 06 4x4 ccsb duramax. It came
with the 5" exhaust on it. I put a Tri dog on it and cut
open the air box, and just recently installed a Egr blocker
plate. The truck had excellent power and good mileage, but after installing the blocker plate i noticed that the
cruising throttle was very good but when i get on it (wot)
it has about 30% less power than before. Funny thing is
it is not throwing any codes. Whats up with that !!!
