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Ok...I've asked similiar questions before...but I'm going to give you guys a scenario and tell me what you think. If I have an LBZ engine...with a MBRP 4' Cat back system, Pyrometer, and PPE standard...and I run it on the 1st power setting...which would be 40 HP..(economy setting). Will I get error codes? Will it hurt my engine eventually..or shorten the life of it? Give me better MPG? AND...will my EGT's be fine? I only tow twice a year...and it's a camper. My vehicle is mainly used for long mileage trips. Thanx.