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

12 replies to this topic
  • twenty34

Posted February 19, 2007 - 02:25 AM


Will a FMF POWER BOMB HEADER work with a stock muffler on an 06 YZ 450? If so, I should feel improvement in my powerband, I would think?


  • Dolce_Grappa

Posted February 19, 2007 - 08:19 AM


Yes it should, Dirt Rider did it with and '07, they felt it improved the power characteristics.

  • TexN343

Posted February 19, 2007 - 01:07 PM


It worked fine with my 04

  • WebbDogg

Posted February 19, 2007 - 04:38 PM


How about a MegaBomb with stock exhaust?

  • TapptOut

Posted February 19, 2007 - 05:33 PM


that will also work

  • cheetah 129

Posted February 19, 2007 - 07:01 PM


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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  • curran

Posted February 19, 2007 - 08:46 PM


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.

  • bleetham

Posted February 22, 2007 - 10:11 AM


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.

  • grayracer513

Posted February 22, 2007 - 10:15 AM


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.

  • lastchild

Posted February 22, 2007 - 01:59 PM


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.

  • grayracer513

Posted February 22, 2007 - 04:26 PM


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.

  • KJ790

Posted February 22, 2007 - 05:55 PM


FMF part number is the same for the 03-06 and different for the 07. I think I'm gonna try a powerbomb on my 06, so I'll find out how it fits.

  • dsrtridr

Posted February 23, 2007 - 11:39 AM


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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