Yes, Puc the HD Screaming Eagle cat. Does all the homework for you cam wise. I also use the S&S cat. Too but they are hard to find anymore. I like the S&S lifters and quickie adjustable pushrods better than what Harley has. I think the easystart cams S&S has is much better than compression releases. I could go on and on but this is a Yamaha forum. Harley is a canvas too work with it's up to you to make a masterpiece.