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2005 Yamaha WR450F

FMF Factory 4.1 Complete Stainless Steel Exhaust System With Stainless Steel Powerbomb Header

Retail: $624.99
$564.99
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FITS: 2005 Yamaha WR450F change
 
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FMF Factory 4.1 Complete Stainless Steel Exhaust System With Stainless Steel Powerbomb Header - Main
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Product Description

FMF Factory 4.1 titanium muffler combined with the stainless Powerbomb head pipe unleashes your motorcycles full potential with massive power increase and substantial weight savings. The combining technologies of the Factory 4.1 muffler and the Powerbomb header have been developed to compliment each other's power characteristics to provide a complete exhaust system that builds power over the entire range.

FMF Factory 4.1 Muffler
  • The FMF Factory 4.1 slip-on exhaust is the same exhaust that professional racers use to bring home championships around the world.
  • FMF constructed the Factory 4.1 slip-on exhaust to offer the lightest weight titanium slip-on on the market. The titanium FMF uses on this exhaust is superior in quality and comes directly from the USA.
  • The technology in the FMF Factory 4.1 slip-on exhaust cannot be found in any other exhaust on the market. FMF developed the proprietary Chamber Core. This FMF original core technology allows for smoother and more efficient exhaust flow to maximize the power output.
  • FMF developed the Factory 4.1 slip-on exhaust to be used for competition and this pipe is ready to take to the track straight out of the box with the AMA stamp of approval for meeting their sound requirements on most motorcycle models.
  • The FMF Factory 4.1 has been designed to allow for easy maintenance with a removable sleeve for repacking.
  • FMF offers the ability to fine tune the performance of the Factory 4.1 exhaust with the addition of tuning inserts and the option of a spark arrestor to give you no boundaries.
FMF Stainless Powerbomb Header
  • The FMF Powerbomb header is the result of countless hours of research and development on and off the track seeking to maximize power from the exhaust system.
  • The unique design of the FMF Powerbomb header provides room for the expansion of the exhaust gases creating a 10% increase in exhaust flow. Translation: more power.
  • The larger "bomb" section of the FMF Powerbomb header creates more surface area to increase sound dissipation and lowering the dbs. By decreasing the sound level, your bike will more easily meet the tight sound restrictions.
  • The FMF Powerbomb header is constructed out of durable Stainless Steel.
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1-4 of 5
Overall
Top 1000 Contributor
Location: Colorado Springs, CO
Worth the investment
Installed on my 2010 KX450 and quite pleased. Installation was easy and I recommend the FMF heat shield. I've ridden a few races and the sheild have protected my pants. Sound great and is a little quiter than stock muffler.
Overall
Pure Reliability!
Verified Purchaser
Location: Prattville, AL
Good Buy
I purchased this full system following a little spill that KOed my factory exhaust. My 2006 YZ450F was no slouch to begin with, this system woke it up even more. I have previously re-jetted carb and run VP racing fuel. Following the install of the exhaust system I have experienced even easier starting, smoother power delivery and a stronger pull throughout the power curve.
Overall
Top 1000 Contributor Verified Purchaser
Best upgrade
This exhaust system is great, added lots of power throughout the rpm range. Sounds great and looks good too
Overall
Location: Rohnert Park, CA
Awesome!!!
I Got This For My 07 Kx450f i was nervous cause it was so expensive. but i LOVE IT. i got it as a replacement my procircuit pipe was trashed. this is amazing. couldnt ask for more. the powerbomb is AWESOME looking and feels amazing. way bigger and better than stock and pro circuit
1-4 of 5
Total Questions (2)
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1-2 of 2
Max128 3 months 9 days ago Location: Spring, TX, USA
Does all of the hardware and the sleeve come with this system?
I just had a crash that destroyed my last silencer and I was wondering if all the frame bolts and the sleeve come with this exhaust system. Also, does the AMA allow FMF exhausts in races?
MotoSport Staff
3 months 2 days ago Location: Portland, OR, USA
You will need to use some of the existing hardware when installing this exhaust, which consists of some of the bolts. The AMA allows any exhaust system that passes the sound requirements of the event.
John14e 3 months 17 days ago Location: TX
How do I jet the carb after installing this system? Does the larger jet come with this?
FMF Factory 4.1 Complete Stainless Steel Exhaust System With Stainless Steel Powerbomb Header How do I jet the carb after installing this system? Does the larger jet come with this?
MotoSport Staff
3 months 16 days ago Location: Portland, OR, USA
This will not come with any jets. You will either need to purchase a jet kit (which comes with an assortment of sizes) or purchase individual needles, pilot jets and main jets off of our OEM site. I suggest a jetting kit since it will have a range of sizes already geared towards your specific model and makes the process of jetting the bike a little easier.
1-2 of 2
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