Any improvement too performance by installing this over stock? I have a XL1200 stage 1 and cams ( Cat 3's ) going in on my sportster and was thinking of up grading to One, is it worth the $$$, will I notice the diff?

 

You'd be much better off with an adjustable aftermarket module such as Dyna 2000 or Daytona Twin Tec.

 

Can you add to that