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Message:: [QUOTE="Hurst, post: 7475216, member: 70494"]Probably cooked the motor and cracked the head. I have an 05 Columbia with an 04 BXS C15 ACERT.  Fantastic motor. 5.8 - 6.5 mpg pulling open deck. Then was with me driving it. I have a driver in it now and he's doing between mid 5's and low 6's. I have no doubt he runs it hard. Mine was originally a 435hp also. CAT wouldnt uprate it because my tranny has the aluminum bell housing. Said it wouldnt hold the torq. So I back channeled one of the mechanics that works there and he did the uprate for me. 500hp/1875Trq. Immediately saw about a 1 mpg increase in fuel economy. Was getting high 4's to mid 5's before turning it up. Also,.. just a FYI. The BXS is mechanically identical from 435 to 550 HP. As for the head,.. I over heated mine and cracked the head. I went ahead and had an inframe done. That was at 1.1 million miles. Truck is now at almost 1.6 million and other than an ECM issue,.. it has not been towed or in the shop for a mechanical failure since the inframe. That was about 3 yrs ago. No EGR, No DPF, No DEF,.. no problems. Great engine. As long as you keep your foot out of it,.. doesnt do too bad on fuel. Chances are thats why the head is off. Twin turbos are fine with me. PITA t work around,.. but if they are already there and working,.. I would keep them. Hurst[/QUOTE]