All fmf pipes are out of stock right now and there is one available on eBay. Does anyone have other suggestions?

 

I ran into the same problem. I was able to order a Megabomb header. It should arrive next week. But I couldn't find a muffler, so I bought a Delkevic exhaust because it was tne only one I could get. It was not my first choice and it is ~insanely~ loud. It does have one advantage in that it has an O2 sensor bung welded onto the midpipe. It also knocks 5 pounds of dead weight off the bike. I'm going to build a quiet insert for it to make it useable.