I would encourage everyone to research systems. I think everyone should spend their money the way they like. Let's do a little apples to apples. Most systems save you the same as far as weight goes. You can't compare a top end titanium system to a stainless steel system guys. From my research Yosh is one of if not the worse system when it comes to performance. They have systems that reduce performance. Their best system, their race system gets you a whopping 8 ponies. You have excellent companies that produce the same weight savings, as good or better quality, and a third more HP.
Slip-ons add zero performance, they do save you weight, they do look better than the stock cans. Typically you can get a great full system for 2 or 3 hundred more dollars.
I'm just saying ...... do your homework people and make a good decision. It is your money and your ride.