I had to go take a look at the pipe in order to figure out what you were talking about lol! The fatboy is a Sirio pipe, can't remember what the EFRA # is but we called them the baseball bat pipe. I tested these about 2-3 years ago on our B7-Pro's and to be upfront with you, none of the guys liked them compared to the 2013. If memory serves me right it really softened the bottom end but it's been ages so I might have it backwards lol! This is a completely different engine though so please let me know what you think once you get a chance to run it. It's a pretty simple thing for me to bring these in so if it works I would be more than happy to add it to our product offering even though I still think that it's one of the strangest (and I should add ugliest lol) pipes that I've ever seen!

Regards,

Ron Hopkins
Werks Racing