The 504 engine mount intercooler with an M3 fit in the last H2x we installed one on here.. It was a 1998 it was snug, but it did fit with the. What year H2x do you guys have??
Jamie / Lakeside

http://www.lakesiderestorations.com/superchargers.phtml

http://www.lakesiderestorations.com/clientsBoats.phtml

Mine is a Boss 272. The seat back is too close to mount on engine.

I didnt realize you had a 272, That explains why your back seat & hatch didnt look tapered forward like < when closed inside.. A friend of mine has a Boss Hammer (smaller than the H2x but looks similar).. That SOB has hardly any space in front of the engine!.. If he follows thru with getting one, It looks as if we will have to do some mod's to install one in his boat.. Jamie / Lakeside