I dont know wehere this great CEN customer service crap is coming from.Their products look good and have great IDEAS but are put together with such cheap materials that it negates the good idea.I have CEN MT SPEC,and it gave me overheating problems from day1 and not due to tuning error.I am not a rookie and have4 other trucks I can run all day without heat issues.I have searched the net and found that overheating is a common problem with CEN.I figured an airleak but with a warranty I wasnt going to tear it down and fix myself.Isnt that what warranty coverage is for?When I mailed the engine with note and sales reciept CEN basically tried to make me look stupid and refused to replace/repair my engine.Offered to rebuild it for$60.00,I have since replaced with an O.S.CV-RX.18,and guess what?NO MORE OVERHEATING.CEN knows they owe me an engine,but I will chaulk this one up as lesson learned.