Hi i am thiniking od installing a SE heavy breather, i have the stock headers with rush slip on's and stock air filter do i need a dyno mapping down?

thanks for the comments

 

You can get away with no remap with just mufflers but a heavy breather will need remap.

 

I did pipes and rode the bike for a while.
the day I did my SEHB I also installed the FMPC.
Bike runs like crazy! I love it!