I have a 2008 5.3L E38 Silverado that was brought into me to tune, it has a homemade turbo install. Stock MAF, Injectors (i am sure they will be too small) the problem I am having is when I get the throttle to a point where I am getting into a few psi of boost I want the PE to kick in, I have lowered the TPS for PE and made sure there is no delay for Pe, yet the enrichment will still not come in until a much heavier throttle? Any help would be appreciated, it is a mild truck so the stock MAF should be ok?