Power was slightly better than stock.
Slightly deeper tone down low (only aftermarket muffler was used as a base line)
No mounting points for heat shield, which was expected.
Bends were a tight fit but no tools or prying was needed.
I needed a sleeve for the pipe to fit (4.1 muffler) that is not supplied in package. This is not the company’s fault however it was a pain to find and order. (Call fmf if you have the same problem)
Overall great pipe and after running it changes into a heat treated look which looks amazing

I read a lot of reviews that said it wasn't worth the money after I had ordered it and got a little disappointed but after i put it on, all i can say to that is BULL. My crf 450 is like a new bike. Amazing powers all the way threw the pipe. Tons of bottom end that was lacking before. The only thing missing is a heat shield.

Bought this FMF Power Bomb a month ago, been riding every other weekend since. I should've put it on yrs ago. Amazing difference, no more flat spot, better bottom end with torque. AWESOME PRODUCT, Thx.

Great performance and easy to install. I used the GYTR power core muffler slip-on muffler. sounds mean. Great power add on. Only wish it stayed silver after start up.

fit very good and i could tell a difference in the power

You can't go wrong with fmf!

This header works and fits great with a Powercore 4 Muffler. I recently installed it on my 2009 wr250f and it is so awesome. It really opens the bike up alot.

The FMF Powerbomb MX header really woke up my YZ250F. The top end pulls very hard! I was skeptical if this mod would produce $170 worth of results. Out if the box the piece looks great and installation is very simple. When first used, the header turns a blueish purple, it's actually pretty neat looking. I could tell after the first fifteen minutes on the bike that I had made the right choice.

Only Con: Does not come with a heat shield, burns pants easily and quickly!