For what it's worth to anyone out there running a Merc 6.2MX, IMHO an Eddie Marine Exhaust System is a great investment.
Before installing the system I was running a 22" Bravo 4 - blade at 5200rpm with four guys in the boat, full fuel and ice chest, etc. With the new system installed under the same load I'm now running a 23" and bumping the rev-limiter at 5350 rpm. I'll be trying a 24" next week. I'm just wondering if I could pull a 25" "labbed" Bravo 4 - blade? The boat is also about 75 lbs. lighter and sounds bitchin!!