mine is a isb 275 hp , i have a programmer on it , id say its in the low 300 range with around 8-900 fts , they do move out , i think mine weighs in around 22k and has no problems laying it down , easily crusies 75 ish , but hills make it drop quick ..... we took it out west a few yrs ago flat towing and coming over the passes on 70 it would only muster 45mph up the hills ....