Which I believe is the much better one from what I have read. The Motion Pro I have gets the job done but, It was so darn touchy like if I put the least little pressure while twisting the screw that blue fluid would start going up. You guys talk about blipping the throttle. The instructions to mine tells me not to Rev it up. After talking with that guy yesterday I really don't see my Sync being covered under warranty, But if it is I will give it one more shot. I honestly don't think just blipping the throttle will mess the Motion Pro up, as long as I don't rev it to say 3000 rpms. But I will be buying that Morgan Carb tune this spring, as it seems like what most people have. The guy that synced my carbs before the rebuild had the old mercury sticks.