Hi Netriders. I'm hoping to get some help with this little problem, any suggestions would be great! So I recently picked up a slightly beaten up and tired GB400 and I'm slowly fixing it up to get her back to a reasonable condition. The bike has been dropped at some stage and the muffler is pretty scratched, dented and a little rusty. I figure the easiest thing to do would be to replace the muffler. Only problem is the GB400 has 2 header pipes that run down in to a collector mounted under the frame and the OD of the collector on the muffler side is 2.5 in so its about 1.25 inches larger than most aftermarket parts. Reducers that size are hard to find and I dont know that restricting the exhaust flow would be particularly helpful. I want to replace it with something simmlar to the original which is a sort of megaphone exhaust with a sweep to run down to the underside of the frame. My thoughts so far are that I'll probably have to get something custom made which may be a fairly expensive exercise but as mentioned before, any suggestions would be fantastic. Cheers!