Hey guys! I just got back from my first trip to the lake with my new boat/engine. That engine ran PERFECT but I do have question though. The boat is a 21' Omega (open bow, semi-v hull.) The engine is a 454 with approx. 475 hp (I didn't have it dynoed, so I don't know exactly.) The pump is a fresh (at least that is what I was told) Jacuzzi WJ (mixed flow.) I don't know yet what size impeller it has. The boat turned 5000 rpm at 52 mph on a GPS. This was with about 20 gallons of gas and two people in the boat. Is this a resonable speed for a boat this size, or should I start looking for something that might be wrong? Several people at the lake felt that the GPS was wrong but I seriously doubt it because it is brand new. I just don't think that anyone was very happy with the results they got. Most of the people still felt that there boats were at least 10 mph faster than what the readings they would get. I guess it just feels faster on the water. Anyway, sorry to ramble on, does anyone have an opinion on my question? Thanks!