Just purchased a 2007 rxt 215 hp used with 32 hours. Dealer said it should run 70 mph at 8000 rpm. So I take it out after purchasing it and had exhaust warning and most it would run is 45 mph so I take it back. They change plugs. Put new oil. New wear rings. Put new alumininum washers on sc. I get it back take it out and most I can get is 59 to 60 at 75 to 7600 rpm. It's getting to be a headache. I take it back and that's we're we stand now. They said ride plate was leaking and coolant was low so they are putting a new ride plate on. But is this going to make it go 65 to 70 and do 8000 rpms. It will do 8200 rpm in reverse but only 7600 wot. This is a nightmare and I just want what I thought I had purchased and the dealer and mechanics can't seem to get it right. Can someone help with advice on what to do