I put this on my 2015 KX450f. Bolted right on and took me maybe 10 minutes. The fit was absolutely perfect. Sound is so much better than the stock muffler and it is a bit quieter as well which I wanted. And motosport.com is the place to get it too! Definitely the least expensive I was able to find and they ship it for free!
FMF Factory 4.1 Titanium Slip-On RCT With Powerbomb Header And Carbon Fiber End Cap
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I bought this full system for my 2015 kx 450f. Bolted right on. It looks insanely good. The "American Made" right on the muffler just tops it off. I felt a huge boost with the mid to top end in EVERY gear. It pulls so much harder and longer in every gear. Especially felt it in second and third. I steer with my rear wheel so it just fits my bike-style perfect. My bike sounds much deeper and meaner. It is also quieter than the obnoxious stock system on the KX. Ive read that the megabomb header offers a little more hit right off the bottom... cant wait to try that out too. FMF makes the best exhaust for an awesome price. FMF for life!!!
Easy to install and worth the money. Would definitely recommend.
[ http://www.motosport.com/dirtbike/FMF-EFI-POWER-PROGRAMMER ]