Ok so yesterday I ordered up the Riva OPAS blockoffs and the Riva aluminum waterbox with a Rude rear tip. Has anyone done this mod before on the 185? The only thing I don't remember seeing is an O2 sensor on the 185 waterbox, if thats the case that will be easy to plug up. Riva advertises it for the 07 and older 215 motors, from reading on here the waterboxes aren't any different in either the 185 or 215's. Will be installing later this week and post how it went, along with a sound clip.