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I have an '05 PSD Excursion and am wondering how much boost is too much... I have a 4" MBRP turbo back exhaust, EGT, trans temp and boost gauge, 4" lift, 35" tires, and 3.73 gears. No tuner, stock intake. I just had the gauges installed and noticed 30+ psi of boost just towing my 19 foot ski...