I have an 2001 Ultra Classic and installed a PCIII fuel injection module and replaced the pipes with dresser dual and vance & himes ovals. Also I've changed out the air intake with screaming eagle stage 1 kit. My problem is I've downloaded the mapping for this setup and the bike pops and backfires when the throttles let off. Should I have it dyno'd and spend the money or is that the way it's going to run with those changes anyhow, dyno'd or not? Any suggestions would be helpful. Thanks.

Hangman

 

Did the download come directly from Dynojet? You can tweak the parameters yourself if you have the savvy?

If not, then dyno (although not guaranteed to eliminate decel pop 100%).

 

A good dyno tuner can fine tune the map and get the lean pop out. And yes you should do it. Its way cheaper than motor repairs.

 

check the pipes and intake for leaks a small leak will cause a pop.