hi guys, I am new in this form and I would like to thank everybody in advance for your help. I have a Nissan patrol gu4 direct injection 2005. I upgraded the exhaust to 3" and I noticed that it doesn't accelerate when I push the pedal down, especially when I'm towing the boat. moreover, I have a strange peak on the boost between 1.5 to 2 bar, and with normal driving, on the motorway, the boost is always between 0.5 to 1 bar. The thing get worse when I am towing the boat.... PLEASE I don't know if its remap problem, manifold dirty please I am confused