Mega Bomb Header? or No?


20 replies to this topic
  • Todddob

Posted September 01, 2011 - 05:39 PM

#1

Hi, I have an 07' 450f. Is this a wothwhile add on at $200+? Will i notice a big difference. I have a stock bike with an FMF silencer. This is my first year racing, im in the old timers class at our local, all sand, track. Low end is key as the deep sand eats up you hp in a hurry. Thanks :)

  • Mr. Neutron

Posted September 02, 2011 - 06:45 AM

#2

Hey, Todddob!

I'm probably wrong here (memory ain't the greatest, sometimes..... :) ), but I thought almost any aftermarket exhaust was an improvement over the stock ones...... I'm very certain that a MegaBomb would be an improvement over the '08 & '09 stock systems...... Member crf450319 would likely know more about that......

That said, I'd bet it would make a difference in your power, on your bike. I had a Dr. D Racing system on my '06, and it seemed to help a noticeable bit. It got "squashed" while practicing at my local mx track, and I really wish I still had that pipe/silencer combo on again.... The stocker is OK on the '06, but I'd feel better when woods riding/trail riding with another stainless steel pipe versus the easily dented stock Ti setup..... Hope this helps some!

Jimmie

Edited by Diesel Goober, September 03, 2011 - 08:19 PM.


  • monkeymotocross

Posted September 02, 2011 - 08:14 AM

#3

hello I have a 2009 yz450 that is completly stock besides a fmf mega bomb header, with a stock can, I have had a yoshimura full exhaust as well and I prefer this set up, it still has nice smooth bottom end power with alot more over rev and mid range, deffentially a nice improvement. I race in the Intermediate class in BC

  • grayracer513

Posted September 02, 2011 - 08:38 AM

#4

"Almost any" aftermarket exhaust will improve an '08-'09 with the shorty muffler, but the OP has an '07, and that bike came with a competent system from the factory. The best full systems will only add a little bit to it.

In general headers with resonators will tend to reduce peak power very slightly, but will flatten the curve, so that it is stronger at both the ends of the power curve. This has some effect on "over rev", the power beyond the peak, but more so on lower mid-range. They work, but it's an open question as to whether the improvement is really worth $200.

If it's more grunt you're looking for, I think what you really want is what you'd get from plugging in an '06 CDI.

  • Hondaman450188

Posted September 02, 2011 - 08:41 AM

#5

I have a 2005 crf 450 with the Mega Bomb header and factory 4.1 silencer. I noticed a lot more bottom and mid with the header and the bike just pulls flawlessly hill climbing and a lot more over rev. I love it!

  • wags450

Posted September 02, 2011 - 09:34 AM

#6

08 YZ450f With a megabomb and factory 4.1 and I noticed a pretty big difference from the first time started it. Again that is an 08 not an 07 and from what I have been reading all over I would go with grays suggestion.

  • Just_a_trail_rider

Posted September 02, 2011 - 10:40 AM

#7

I have a powerbomb headers I got for my wr450. I was a little different for sure, not much though. I don't think it was worth the money at all. I noticed a bigger and more meaningful improvement from the 4.1 pipe on the end. Even worse, its very, very easily dented.

Knowing what I know now, I would not have bought it. I should have invested money in cams instead.

  • wags450

Posted September 02, 2011 - 11:33 AM

#8

Even worse, its very, very easily dented.

Knowing what I know now, I would not have bought it. I should have invested money in cams instead.


If you get the SS it holds up very well. I ride in the rocky Ca desert no dings or dents.


If you don't have suspension done yet I would really suggest getting that done.

  • primerib108

Posted September 02, 2011 - 12:22 PM

#9

Only have the powerbomb header and they are very strong build pipe. Didn't notice much difference in all around power but it helped mellow out the sound and it is a much cheaper alternative to replacing a damaged pipe than stock from yamaha.

  • Just_a_trail_rider

Posted September 02, 2011 - 10:14 PM

#10

If you get the SS it holds up very well. I ride in the rocky Ca desert no dings or dents.


You are probably right. Mine is titanium, which is not good at all for offroad.

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  • MaxPower

Posted September 03, 2011 - 08:06 AM

#11

[COLOR="DarkGreen"]I guess it depends on what 200 dollars means to you.
Yamaha 450s sure make a lot of power stock.
[/COLOR]

  • Wiz636

Posted September 05, 2011 - 06:06 PM

#12

I have a mega bomb header and Q4 silencer on my '08. Definitely improved the low end grunt but the over-rev suffered a bit...don't know if that is the header or silencer though.

I got the stainless mega bomb and after a bunch of hare scrambles, endurocross-type riding, and general offroad abuse it still has no dents so it gets an A+ for durability.

  • sacfelix

Posted September 05, 2011 - 06:32 PM

#13

I ride an 06 YZ450 and I have the Ti. mega bomb with a 4.1c can with S.A insert. I didnt notice any huge power gains from the mega bomb but I did notice it quited it down a little more. The biggest improvement I noticed was when I went from a stock can with a PMB end cap to the 4.1C can. Holy Crap was it noticeable.

  • Mr. Neutron

Posted September 06, 2011 - 05:59 AM

#14

The biggest improvement I noticed was when I went from a stock can with a PMB end cap to the 4.1C can. Holy Crap was it noticeable.



Sacfelix, was that in power, or noise, or maybe a little of both???

Jimmie

  • 92db

Posted September 06, 2011 - 10:35 AM

#15

The biggest improvement I noticed was when I went from a stock can with a PMB end cap to the 4.1C can. Holy Crap was it noticeable.


Your post is another reason why I am not a fan of putting PMBs on stock cans. If the muffler is brand new then it makes a little more sense but no way if the muffler has a lot of time on it.

  • grayracer513

Posted September 06, 2011 - 11:25 AM

#16

A PMB or DrD end cap/spark arrestor conversion makes a lot of good sense for a bike that has a decent stock system, such as the '04-'07 YZ450, but with an '08-'09, it's like buying jewelry for a pig.

  • sacfelix

Posted September 07, 2011 - 07:31 PM

#17

Sacfelix, was that in power, or noise, or maybe a little of both???

Jimmie


The 4.1 can improved the power all around and the noise output seemed no louder then running the unmodified stock can. When I installed the PMB end cap on the stock can my bike was fresh off the show room floor. Once I installed the 4.1C, I then installed the S.A insert but still sound tested at a 98.1. So I installed the Megabomb and now she tests at 96.8. Still not 96 flat but close. I have not run any D36 races yet and have been hesitant because of it. I have ran several MRANN races and the VCGP the last 3 years and they dont even sound test just check for the sparky.

  • Todddob

Posted September 14, 2011 - 09:06 AM

#18

Thanks guys, I will go not go buy the Megabomb. In the offseason I will spend the money on revalving the suspension and get it set to my weight. Sounds like the megabomb would be a bigger improvement for the 08 and up.

  • wags450

Posted September 14, 2011 - 09:58 AM

#19

Sounds like the megabomb would be a bigger improvement for the 08 and up.


Its really great with a full system but i think the suspension will be a huge improvement for you.

  • yamaduner

Posted September 14, 2011 - 02:38 PM

#20

I have one on my 2003 yz450f and absolutely LOVE IT!:) (as a full system...and I notice the difference)

Edited by yamaduner, September 15, 2011 - 03:29 PM.






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