fit very good and i could tell a difference in the power
FMF Powerbomb Header - Stainless Steel - Motocross
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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!
I bought this with the FMF 4.1 exhaust. It is light weight, durable and was easy to install. There is no heat guard on this so make sure to wear long pants or riding pants to keep your leg from getting burned.
was very pleased with the product. key word "was". after a year of use the header broke in half. dont think they are supposed to do that. wouldnt mind if they sent me a new one free of charge.
once hot the header turns a golden brown which personally i think looks good. the power increase i could feel mid to top end. it feels like it will rev faster on the top. if anything it quieted it down from stock. installed on a 06 yz250f
I really like the power increase it give in the mid to top end range of the motor. I ride an 07 YFZ 450. the only down side is that when the muffler gets hot, it looses its stainless finish look. but you can get a cleaner to polish it back up. easy to install.
Great header sounds good and noticable horsepower, and it looks great!
Powerbomb works well with Power Core 4 exhaust. Good power and not too loud.
I bought the stainless instead of the ti to save money. Glad i did because i got what i paid for. did not get a major power increase but a little better than the stock. If looking to buy the powerbomb, don't waste money on the titanium, go for the stainless.
And to answer your question there's nothing you'll need to do to the engine before installation. Please take serious note to my first comment about fitting this head pipe to anything other than FMF exhaust systems.