What do you have on your bike now? Is it what is in your avatar?
The bike I'll be getting has a pretty solid set of 4 into 4 pipes, but I'm thinking about swaping it out for a 4 into 1. The bike is straight, but not all original, so I'm not too worried about keeping it that way. I might think about some kind of trade at some point.... but I don't have the bike at my place yet. In a week or two.