Yoshi owners, I need your input!

I have spent the last two days reading all the posts about the Yoshi exhaust. My question is, is there a big difference between the Yoshi head pipe and the stock head pipe. I was hoping anyone that has installed the full system could maybe give me some input. They appear to have about the same bend, but I can't really tell if they are the same size pipe, or if the Yoshi is a little bigger. What I'm getting at is should I go ahead and spend the money on a full system or is there so little difference in the head pipe that I can be a cheapskate and just buy the slip on.

Thanks,
Mitchell