Cummins x15 low boost after delete

[J_Rok]

It think your answer is in your question, you said it boosted easy 45psi before the guy “you trusted” fixed your bad delete then 21 psi after. The pros on this forum get cranky real fast with people who don’t listen. Figure out how to get that tune sent to Rawze like he asked of you and check your CAC system for leaks with a proper tool with a psi gauge if you haven’t already. I wouldn’t trust anyone with my ecm tuning except for a few select guys on this forum. You seem to be set on the fact that it can’t be the tune but that’s the first thing I would suspect.