Had the Fullsac DX pipe installed with a set of V&H Monster Ovals a while back. Sedate and deep note, sounds great when you get on it. Had to adjust headers out a fraction to the right to sufficiently clear the rear brake plunger bolt (it did clear but was very close when engine was running and moving around) which meant spacing the right footboard out a few mm, and if you look really close at the mufflers from the rear they aren't QUITE dead centre (OCD ALERT LOL) but no clearance issues now. It probably would have been fine, but oh well it's done now!
Very happy with this setup. The tune (local dyno tuner) is great, I'm actually reconsidering even doing cams. Runs great for a stock motor in a big bike.