It's been a few years since I spent unimaginable hours searching for 4" tips. Along the way I saw some fishtail tips, but probably remains unlikely there are any to fit 4" cans. The primary market for those is of course HD and the like with generally 2-2.5" pipes. But I believe even some HD's have larger pipes. Google, time & patience are your friends. The problem is they're generally sold as bike specific and don't usually list an insert end size. Some research could resolve that issue.
I did eventually find these, in the pic, for $20.00/pr. once I had them & they fit I introduced them here to the board. Well, we all purchased the last remaining stock of a discontinued item.
There is however someone [a board member] who fabricates small batches of them from time to time. I can't remember who that was at the moment.
Try an "exhaust tips" in the old & recent board archives if your interested. Maybe someone will chime in with better info.
There are not many 4" tips out there. Good Luck
BTW if your pipes are stock it may be hard to find a tip to slip over the rear baffles. Most tips are inserts.
