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Excited to announce my project for the next few weeks, I've got a 97.5 290 and I'll be swapping my old 454 for a much newer 496HO; almost 40% more HP. Sea trials will give me final guidance and reviews, but trying to decide whether to change drive gearing (and go to B3X) or new props. Open to...

With a boat that is adequately powered you wont notice minor gains, I need every bit of power I can get so minor changes are noticable

Routing the exhaust all the way through the drive and out the back increases back pressure. It's not as much of an issue on smaller blocks, but it does cause issues on the big blocks.

Interesting theory. Any more insight as to why you think it?

I wanted to publish a little information because I've seen a lot of debates on whether there are any differences. Background: I have a 98 290 with a single 454 Bravo 3, while I specifically wanted this under-powered combination, any time something isn't on point, I notice. I recently replaced...