Can someone explain why I am having such a hard time finding a 4 into 2 exhaust replacement for my 83 XJ750M ? I've been to dozens of online stores and all I can find is 4 into 1. The only problem with the 83 Midnight Maxim I just bought is it needs a new exhaust. Is this why I got it so cheap? other than the exhaust it looks and runs like new.