Overboost while towing. What to start with for a fix?

[Cantbuytime]

Everytime I read a thread about over boost and how to fix it. It goes off topic. I have an sct 3015r. Dp custom tune, egr ******, race exhaust. If I tow my 2500lb trailer with any tune other then the tow tune. I get over boost in ten minutes of driving. So if I g tow tune No overboost and horrible fuel fuel mileage. I have read something about turning off this code in the tune. Or s dirty EBP or dirty map sensor. Where do I start?

 

[griz700rocket]

EBP sensor would be where I would start.