Guy's I did a 701 drop in with the rhass kit in my 550...and I'm not sure what the damn problems is. It idles fine in the water and on the hose but it has a bogging issue and not a whole lot of snap. Thinking it was an exhaust issue so I bored out the thru hull exhaust port and put in a 2" piece of pvc to a xp717 waterbox and then ran the oem superjet hose from the waterbox to the engine. As a side note the engine is kind of mix-matched 61x bottom, 62t cylinder, with a 61x head. Any ideas that would help before summer is out would be greatly appreciated!