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twenty34

FMF POWER BOMB HEADER - Will This Work W/ A Stock Exhaust?

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i was on the phone with fmf last week and he said that their slip-ons work with the stock headers but their headers DON"T work with the stock muffler. that doesn't really make sense. does it???

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Check out my thread on 4th or 5th page (06/07 megabomb difference)My megabomb was an 1/8 inch smaller than the stock muffler connection.

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I just bought a FMF Powerbomb header for my 2006 450F. Even though it says in the book 2003-2006 YZ450F I had my doubts about it fitting the new bike. I tried installing it last night and it barely fits and hits against the water lines coming out of the water pump. I mean, it's pushing right up against the water line. Obviously this is a no go, I'm returning the pipe tomorrow and I guess I'll be putting on a Megabomb instead.

I was hoping the powerbomb would work since it seems more durable. I've heard of Megabombs getting dented from roost and one that got crushed in a low speed crash. I'm running a FMF Q2 slip on and was hoping to get more snap on the bottom using the Powerbomb.

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There would be no reason to think that an '03-5 header would fit an '06. The cylinder slope angle is quite different on the two engines.

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There would be no reason to think that an '03-5 header would fit an '06. The cylinder slope angle is quite different on the two engines.

I have a powerbomb header on my '06 and it fits just fine.

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The header for and '03-'05 is the same 5TA-14611-00-00 for all three years.

The header for the '06 is different (2S2-14611-00-00), which is because of the changes to the engine layout. The '07 is different again (2S2-14611-20-00), but that has to do with an exhaust redesign using a different muffler and a stepped header. I'm certain they make one that fits, but I remain highly skeptical that they are the same part as the older one.

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I just installed a Megabomb on my '06 YZ450F and it was listed as fitting 03-06. It fits fine although it is connected to a FMF Ti Powercore exhaust. The Megabomb really helped the low end on which was my only complaint about the bike. It made a much bigger improvement than the exhaust did.

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