Can't help with the VH setup, but lotsa guys with the bike do the baffle mod. Punch out the rivets in each muffler, pull off the outer lip, pull out the silencer, and drill a few extra holes. Guys say it sounds great with modest decibel increase (my 93 was very quiet stock). As for power increase, I doubt it, but I wouldn't plan on huge increases out of this engine. It just wasn't optimized for power at all, unless you wanted to do cams and carbs. That's actually a big reason why I stepped up to a 94 CB1000--more power from the factory, with the look and feel of the NH. It's the NH's bigger brother! Anyway, maybe that's an idea, too.