If you change your stock mufflers on a 2009 Electra Glide Classic to Screamin Eagle mufflers and a K & N air filter do you know if the bikes ECM needs to be re programmed?

 

Welcome to the Forums! The short answer is "yes". If you are putting on Slip-ons and upgrading your air cleaner, you should get the download from HD. It will run you about a buck and a half but you need to do it.

 

Reprogrammed or a Power Commander( some type of fuel management system)