If I install an HFM muffler on an 09 Mud Pro with fuel injection, will I have to retune ot map the injector ? Thanks

 

It should compensate without the need to remap....of course if you want to get the absolute most out of the pipe/tune you should consider remapping.

Make sure you get the "quiet core" insert for the HMF...it doesn't do any of us (or our beloved sport) any good if you're splittin' eardrums, and the QC is only $19 more

 

Thanks for the feedback, will do on the QC. Got on a scary forum last night talking about broken axles and drowned EFI. Hope that's not the norm. Been on Hondas and Yamas past few years. Last AC I owned was in 2000.