The MAC was okay but I wanted to open it up a bit. The damned baffle would NOT budge. My original plan was to drill a few holes in the internal (forward) plate and then six 3/8" holes in the outer plate to let it breathe a little more. I didn't want to risk damaging the pipe so I started exploring some other options. I decided to go with the V&H. Couldn't beat the price and they have a good reputation. It's louder but totally reasonable, more aggressive sound. One other thing was that V&H recommends rejetting the carbs where a couple of others say it's not necessary. I would go with a V&H. It's lighter and I think it performs better. They cost about the same. I bought mine from Bike Bandit; $359 US delivered. I sold the MAC for $175. Nothing other than detailing it here and there and maybe an oil cooler. I have a GS1000ST that I screwed up when I installed a big bore kit in it. It ran so bad that I hardly ever rode it and finally parked it. Then it was vandalized. Long story short, I'm doing a frame up resto on it and I am seriously considering reverting it back to stock displacement. I have everything except stock cams, but Yoshimura Stage One cams are pretty mild so I may stay with them. The 1000EN will remain stock.