I was looking for differences that might have been noted by some & preferences. I should have specified that I meant "non-stock" exhaust. I can appreciate the feeling by some, on liking a balanced look on a bike. Some bikes, in my opinion, seem to look better with a 4 into 1, while I feel some don't. The 4 into 4 that I was actually referring to, would be like a set of stock pipes with something like megaphones fitted to them. I know that, to get the most out of an exhaust system, it needs to be a "tuned" system, not just some old set of pipes (of ANY configuration) thrown on there.
Do a little bit of research to find out which ones are nearly impossible to find. Whichever style is hardest to get/most expensive; well that's always the best one. 
Bill, how long have you been messing with these things? Haven't you learned anything yet? 
Remember, ANYTHING made out of unobtanium is better than the common stuff.
Might know that okie would be busting my chops here!
That's all right okie, you'll get yours.
BTW, most of the ones I had previous experience with were 1 & 2 cylinders and, yes I know that they are basically the same (just more cylinders)
Take care all (you too, okie
), Bill
