Buddy of mine has the Jardine's on his 1050 speed triple. They sound sweet.
I've done 2 installs of the moto GP slipons on the 07 GSXR1000. They are super easy and sound sweet. The catalyst muffels it pretty good. Also comes with removable baffel cones if you want it quiter. The only thing I don't like about it is they use these pipe clamps that are very visable. Looks like shit in my opinion. The kit does away with the little factory cover that hides the catalyst. Last one I put on I made a couple little brackets to put that cover back in place to hide the ugly. Looked 10x better.
If I'm buying the system(meaning it didnt come on the bike used) I'm going with the Akra. Fit and finish are outstanding and the power gains are good, and it has a nice mellow sound. I'd also consider Arata. Anything else I'd take on a bike used but I'd never purchase myself.
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