Shopping CartCLOSE
  • Your cart is empty.
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header

$607.98 - $719.98
10% Off - Save up to $67.00

Item #FMF00EY

Read More
13 Reviews
4.8 out of 5 stars
5 Star   11 4 Star   2 3 Star   0 2 Star   0 1 Star   0
Write a Review

Write your review and you'll automatically be entered in our monthly drawing. Include an image or video to DOUBLE your chances to win!

Write Your Review Write a review to win $500
All Reviews
Riverside, CA, USA
Factory 4.1

i have a crf150r expert and completly wakes up the bike

crf150r
Verified Purchaser Top 250
Littleton, NH 03561, USA
FMF 4.1

This exhaust is Great! Fits well,looks awesome and performs better then a more expensive brand I had on my bike

Kansas City
Great product

Purchased this combo with the titanium header. Definitely felt a noticeable difference in power throughout the entire range of my throttle. This setup looks great, sounds great, and was very easy to install. Worth every dollar!

Verified Purchaser
Brentwood, NH, USA
Wake up Call

If you want to awake up your YZ450 this is the way to go. Makes a big difference. You will notice as soon as you twist the throttle. You will need to rejet but it isn't as big a deal as you might think. Just follow the others on the 4 stroke websites for your elevation and you are good to go.

Redding, CA
Beautiful

Helped the bottom and mid range on my kx250f. Sounds great, looks even better! IM really happy with my purchase, I would recommend rejetting the bike once you put it on.

Top 1000 Contributor
san jose, ca
Great pipe

This is a great pipe. It adds alot of power in your bottom and your mid. You can feel the difference in power the second you ride it. Looks and sounds great.

san diego ca
Durability 4/5 Ease of Installation 4/5 Performance 4/5 Power 4/5 Style 5/5
Great

Went on a 2009 RMZ 250. Install was a no brainer very easy simple bolt on deal. Sound is good, not too loud (which is good). Pretty much on par with the other exhasts ive had, helps the bike rev quicker, added a much needed boost on the top end, help pull out of corners better. Had quite a few big crashes with the pipe installed and all seems well with it, its been holding up very well.

Bloomington, MN
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Power

this is a great exhaust system. adds a lot of low end power. on my 2009 kx 250f. sounds great too.

Durability 5/5 Ease of Installation 5/5 Performance 4/5 Power 4/5 Style 5/5
Good bang for your buck

I put this system on my 2009 yz250f and i immediatly noticed a difference in the sound, which was much nicer and more aggressive, but also the power output. 09 yz250fs dont have the best engine but this system definatly helped in the bottom end and a little up top as well.

battle creek
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
WAKE YOUR BIKE UP TODAY!!!!

I put this system on my 2007 CRF450R which in stock form is a POWER HOUSE!! But a after putting this system on it brought me a whole new name to POWER HOUSE!! It with out a doubt woke that bike up and brought new life and more power to it. The system was very easy to put on and the only thing that was weird to me for a minute was it didn't use any claps like the old stock one but it uses high temp. Selacone to seal it. Which in the end works great! It also came with a free wash plug. This system is worth every penny for the styling and most important the tons of extra power you can't beat GREAT BUY!!!!!!!!

See 3 More Reviews
16 Questions
Answered:   16
Not Yet:   0
youngchappo08
Q: Would it fit my 08 yz250f and is it hard to instant
Over 10 months ago
Dani
Top 50
Over 10 months ago
A: Yes, this exhaust and mid pipe both fit your bike. The instillation should be pretty easy, if their is any complications FMF has great tutorials on their website for help!
Frank
Q: When will the muffler be in stock again?
2 years 11 months ago
MotoSportExpert
MotoSport Staff Expert
2 years 11 months ago
A: Please contact one of our sales professionals to inquire about availability.
Dirt Bike / ATV: 1-888-676-8853
thedude
Q: What is the recommended jet for this setup for my 07 honda trx 450r
Over 3 years ago
MotoSportExpert
MotoSport Staff Expert
Over 3 years ago
A: There is not a specific setting I could give you for jetting your bike. It would really depend on your location (altitude/temperature) and how your bike is running with the current jetting. Jetting can be very tricky, there isn't one setting that will work everywhere with every bike. I would recommend taking your bike to a local motorcycle dealership’s service department to have your bike properly jetted.
Yama450
Q: Do I need to change my jet on my yz450f ?If yes what would be the size of the jet ?
Over 3 years ago
MotoSportExpert
Top 1 Contributor
Over 3 years ago
A: There is not a specific setting I could give you for jetting your bike. It would really depend on your location (altitude/temperature) and how your bike is running with the current jetting. Jetting can be very tricky, there isn't one setting that will work everywhere with every bike. I would recommend taking your bike to a local motorcycle dealership’s service department to have your bike properly jetted.
Caleblouden23
Q: What will i need to buy to rejet my 07 kx250f bored 40 over, after I installing this system
Over 3 years ago
MotoSportGrantK
MotoSport Staff
Over 3 years ago
A: Yes, typically after installing a full aftermarket exhaust system you will need to re-jet your carburetor. I would recommend taking a look at the JD jet kit that will come with jetting instructions for your 2007 Kawasaki KX250F which you can find here: http://www.motosport.com/dirtbike/JD-Jetting-Jet-Kit
Tyler
Q: What would be a better choice for a 2007 wr450f
Over 4 years ago
Im looking for a system that will give better power and sound to my wr450. I cant decide between the yoshi rs-2 comp or the fmf factory 4.1 with megabomb . They both seem like good systems but im not sure which would benefit me more
MotoSportGrantK
MotoSport Staff
Over 4 years ago
A: Both are great exhaust systems and you can't go wrong with either. I would recommend the FMF with Megabomb header for your 2007 Yamaha WR450F. The Megabomb header will give you a little more top end as well. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Tyler
Q: Does this come with new header gasket?
Over 4 years ago
MotoSportGrantK
MotoSport Staff
Over 4 years ago
A: No, it will not come with the exhaust gasket. You can find the exhaust gasket for your 2007 Yamaha WR450F here: http://www.motosport.com/dirtbike/oem-parts/YAMAHA/2007/WR450F/EXHAUST
bikeislife
Q: Does it fitr on a crf150r and would it be good for it
Over 4 years ago
MotoSportRyanT
MotoSport Staff Expert
Over 4 years ago
A: Yes. The FMF Factory 4.1 Exhaust System is made for your Honda CRF150R and it would also improve the performance of your bike over the stock exhaust. When switching to a full exhaust system you may need to re-jet your carburetor after installing the exhaust. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct Exhaust System for your bike.
oraifan
Q: What do you prefer, powerbomb or megabomb?
Over 4 years ago
i need it for motocross
MotoSportRyanT
Expert MotoSport Staff
Over 4 years ago
A: I have used both the PowerBomb and the MegaBomb on a Suzuki RMZ250 and while both offered great gains over the stock header, I would say the MegaBomb gave better overall performance. The unique design of the header allows for better low end torque similar to a long header while also improving top end power much like a short header. It also gives the bike a great sound without it being obnoxiously loud.
Anthony45
Q: Have a 08 yz250f, Hurd I dont need to rejet just make sure the fuel screw is adjusted properly.
Over 8 years ago
Just seeing if anyone has anythoughts on this, thank you.
Drewski
MotoSport Staff
Over 8 years ago
A: You always want to check your jetting after installing a complete system. Depending on where you are at and what mods you already have done to your bike you may only need to play with the fuel screw, but the easiest way to do it is install the exhaust, see how the bike responds, check the plug for any indication that the jetting needs to be changed and take it from there.
1 - 10 of 16
Fitment
See all bikes that this part fits...
See Fitments
# Part Numbers
Exhaust
Product Variant Manufacturer Part #
Natural Titanium With Stainless Steel Mid Pipe 041157
Natural Titanium With Stainless Steel Mid Pipe 044206
Blue Anodized Titanium With Titanium Mid Pipe 041291
Natural Titanium With Stainless Steel Mid Pipe 041171
Blue Anodized Titanium With Stainless Steel Mid Pipe 044235
Header
Product Variant Manufacturer Part #
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 044352
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 044351
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 044350
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 041429
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 041431
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 041426
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 041296
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 044227
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 044140
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 044316
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 044353
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 044357
FMF Factory 4.1 Complete Exhaust - Stainless Steel Mid Pipe With Megabomb Header 041197