KDX220R came with FMF Fatty pipe - change it or leave it?

[Suzy America]

Guys, my bike came with the FMF Fatty pipe and some kind of FMF silencer, though all the stickers are so worn off that I have no clue what model silencer it is.

Here's the question - considering that FMF doesn't recommend the fatty for the KDX220R, and their site lists only the desert rev pipe for fitment, is there any harm in leaving the exhaust as is? Will that desert pipe do anything that the fatty isn't already doing? Does the fatty have any negative effects on the engine?

Thanks guys.

[KDXGarage]

Fatty has not been made for a KDX in a long time. It is still made for other models.

I wouldn't worry about it.

Post some numbers and letters from the spark arrestor. It might be the same model as a current model.