Ya know, I wasn't real excited about the dual pipes on the side of the s4r when I first saw it. But now, especially with all the nice aftermarket pipes showing up, I'm really liking the setup. They go well with the SS swingarm I think.
I'm having a hard time making up mind on pipes (i.e. dual side highs, or opposite side highs). Depending what pipes I get will determine the fate of my tail too. I'm waiting to see what Termi and Sil will do in addition to what they have now.
The S4R pipe questions is something I spend a lot of time thinking about. This is why I sent my pipes to strati for the mod. Now I can wait until something I really like to come out. I am happy with the mod and look. And can patiently wait for a nice dual sided full system to come out with a look I really like.