I have recently fitted a full GPR Exhaust system to my KLX250 (2013). From using this forum I can see that the FMF pipe's seem popular but for me the GPR system was avaliable at the right price her in the UK. GPR are an Italian company so I don't know the availability of these systems in other parts of the world.

Anyway the full system was easy to fit and came with all the fitings needed. The exhaust come's with a removable DB restrictor and a removable baffle.
With all the restrictors removed the system is loud but sounds really nice. As I don't want to upset my neighbours I run with both restrictors in. Even with both in it sounds nice and I sitll get a better performing bike.

I can recommend this system.

P.s whilst out at the weekend on some tracks the mighty KLX out ran a couple of Honda CRf250L's

 

Your review is missing pics of your bike!