Originally Posted by 1loud96

Hello all- I have a 2008 Sportster that I have installed Samson Street Sweeper pipes and a HD Heavy Breather air cleaner on and need ECM advice please.

The air cleaner instructions read "ECM calibration required" BUT I contacted my local HD dealer and the Service Manager told me: "the Harley download is for Harley style slip-on mufflers with stock head pipe and Screaming-Eagle high flow air cleaner. I will install the download on your bike if thats what you want. With the experience I have had with aftermarket exhaust and the download sometimes are not the best match".

So then I contacted Samson and was told: "We would recommend that you change the settings of the EFI as per the instructions with your air cleaner. They would know best what is needed with their product and we would suggest following it in order to get the full
advantage of the product. And since you are installing our free flowing
exhaust system it makes sense to change the settings".

I've searched this forum and there seems to be many different opinions on ECM calibration ranging from Sportster ECM's are not programmable at all to calibration change is not even required because the ECM and oxygen sensor will automatically adjust for the modifications.

The bike seems to run just fine but I'm concerned about causing damage or missing out on some peformance gains.

Can anybody help set me straight and tell me what I should do?

thanks