So I recently picked up a 09 klx250sf and I want to make it sound a little beefier than a scooter. Found a fmf 4.1 exhaust on marketplace that came off a 250 hawk enduro. Will this fit mine? If no what’s a cheap solution?

This is the exhaust I found

 

Delkevic.

 

The general shape looks like it might fit. but that's just a wild guess.

You could take your exhaust off, lay it out, take a picture of it, size the image to match the image of the FMF, and compare the two images. That would give you a much better idea.

 

What is a 250 Hawk Enduro? I'll wager $50 it's not going to fit. It looks similar though, but it's usually more complicated than that.