ive had this on my bike for a few weeks now and its slip on is rattling but the header and stuff is all good. idk the hp gains but it sounds great
FMF Megabomb Header - Stainless Steel
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Installed on my 2014 YFZ450R, Love the look and power of this pipe , I paired it with my big gun
evo R slip on , had a hard time finding out if it would fit so I'll make it easier on you it does fit this slip on
Decided to add the Megabomb header to my previously installed FMF silencer. Very light weight but not as solid as the OEM header. Installation was simple however joining to the FMF midpipe/silencer was difficult. Even with high temp grease, difficult to join together. I have never had this problem with FMF before. Likely just a "one-off" thing. I have already purchased a carbon heat shield to place over the header - you will burn your boots/pants if you are not careful.
Unable to detect a power increase but slightly more responsive throttle. The biggest change occurred when I installed the FMF silencer 6 months ago. It will give your bike that factory look.
this thing looks like i know what i am doing, increase in hp i don't know,bike runs great,if nothing else a conversation piece ,$ well spent i think,white bros slip on ,had too jet way rich-w/3" air box mod way fat on the main+pilot jet,runs hard +fast hard on tires
Probably recovered some hp compared to my stock dented exhaust however the " bomb" part of this pipe is just looks. The exhaust is the same diameter throughout on the inside.
I knew as soon as I bolted this on I would notice a massive difference, and I was not disappointed. I could not ask for more performance from the header. Combined with the Q4 slip-on, this REALLY woke up my 2006 CRF450X. The exhaust note is much improved without being obnoxiously loud as well.
My only issue is that the location of the "Megabomb" is right where my leg tends to move to in certain cornering situations. As a result, I melted my pants the very first ride with it. Definitely an annoying oversight. Ordered the Moose carbon fiber guard and I am hoping it fixes the issue.
FMF is First Class ....
I would have to say I was skeptic about this product. I installed it on my 07 crf250r and at first I was concerned. The installation of was not bad until I had to place the mid pipe onto the Megabomb. The inner gasket had to be removed in order for them to connect. Therefore leaving metal on metal contact and a loose fitting. I applied high temp gasket silicone to the connections to fill the gaps and tightened the clamp to the max. Solid connection so far. The bad thing about this product that must be said is that it will GLOW RED HOT. When first installed and running at idle for about 4minutes, It began to glow hot at the header connection. After a few rides it became tolerable and less noticeable. I would recommend a heat shield, but can be rode comfortably without. On the plus side, this pipe rocks! You will notice a different in engine response and overall performance through each gear. Well worth the price for the extra boost, plus it's FMF, so you know it's great quality. Buy it.
This header fits perfect on a 06 yz250f. looks great and adds lots of power when used with ti powercore
Went with the slip on first, but after adding the mega bomb WOW what a difference. Better hit and mid range really comes alive. Not much difference on the top but overall a good purchase. YZ450F
bolted on in minutes, excellent fit and finish, really woke up the bottom end power.
1st it adds more HP than any other exhaust on the market, looks great and sound powerfull and best of all, free shipping.
i bought this along with the factory 4.1 silencer and it helped me alot with my holeshot but the combo was barely worth the money
The megaBomb header is the best header iv ever used, iv put it on many of my rides, instant difference in power, I'm not a hundred percent sold on the hp gains, but never the less it makes the power band of the bike or quad much smoother and long thoughout. I used other headers befor and Never noticed such a difference as this one, get it stainless steel.
FMF megabomb header is a great product! I don't know why people say it gets red hot. I ride a 2005 HOnda CRF 450x, and it definitely creates typical 4 stroke heat. It does not get overly hot though. No guard or wrap needed! I also put a FMF Powercore 4 muffler on, and I have noticed an increase in power and snap. I have always had bad issues with my bike bogging when I pour on the coals, so I have a JD jetting kit, a Boyeson Quickshot 2 accelerator pump cover, and a Twin Air power flow air filter with air box mods. The darn thing still bogs!!! This is a common problem with this model. I am getting closer, and with some more jetting tuning should have it eliminated. If you want more power, definitly go with FMF, but expect the bike to need more fuel in the low end...
Added this Mega Bomb to my Powercore 4 slip on and Wow! This header really make this bike open up! Very happy with the performance of this FMF product.
May need to switch to pants that are inside the boots or get a good exhaust wrap on it. IT GETS RED. Before anyone asks or thinks you running lean... I've got fuel to air mixture set professionally, on a dyno with fuel air monitoring.
Stainless just glows under a lower heat, and the walls on this pipe are thin.
I noticed immediately that it pulls from down low into the power band... dyno says that is 8400rpm for peak hp and 8150 for peak torque. it will pull from barely rolling in third well into the power band fast and the first day almost left me behind.. bottom line this pipe works very well.
My only complaint is... well I love the feel of it... My crf 450x will pull with throttle and is now much less forgiving to poor throttle control...
I love it. Very good buy. It might need a cover because it gets red hot.