acguy wrote:
Why not try talking to you local volvo penta shop or call volvo tech support
That's the problem, the local dealer the Four Winns website refers me to replied and said yes they could be installed. The dealership I bought the boat from said no. I've emailed Volvo direct and I'm waiting on a response but I think I have figured it out and it does not look like it is physically possible. You'll see from these images how the Captains Call exhaust connect and offer direct thru hull or standard exhaust:

Those would fit fine on a Volvo Penta GXi 270:

Now my "Super Ultra Low Emission" GXi-C-270 (surely designed for California) has huge catalytic converters in the exhaust manifolds:
