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Setting the standard for power and value, the HMF Performance Series has been track tested with over a decade of championships. The specially designed, unrestricted core provides maximum flow and allows the exhaust to increase horse power and torque evenly throughout the entire power curve. The trademark to the HMF Performance Series is the exhaust's sound. With a deep, aggressive sound, you'll typically see a 2 - 10 dB increase from the stock exhaust system.
Powersports full system.
Designed for 4-stroke sport quads.
304 stainless steel headers and inlets.
T-6061 aerospace-grade aluminum canisters.
TIG welded aluminum brackets.
Heavy-duty stainless steel rivets.
Two-piece billet end caps that accept a U.S.F.S.-approved spark arrestor (included) and the exclusive HMF quick-change low dB Quiet Core (sold separately).
Packed with Bristol Core brand pillow packing.
Sold as a kit.
Includes installation instructions.
Two-year manufacturer's warranty.
Manufactured in the U.S.A.
Note: HMF Exhausts are designed for closed course competition only.
Equal Power: The Performance Series distributes power evenly throughout the entire RPM range.
2 - 10 dB Increase: Depending on the model, you can expect a 2 - 10 dB increase over stock.
Unrestricted Core: The Performance Series uses a 2-1/8" non-restrictive core for maximum flow.
Less Weight: The exhaust shell is made of T6061 Aluminum that weighs substantially less than stock.
I got this for my 2013 Honda trx450er and as soon as I took it for a rip I felt a huge difference in power im done using fmf I think im gonna use hmf from now on I would defiantly recommend this to anyone.
5 out of 5 stars
Over 6 years agoLocation: Tulsa, OK
I picked this pipe up on recommendation from a friend, and with the custom jetting and uni filter, and lack of air box lid this thing screams. I love it, but would not recommend it to anyone that doesn't want to be loud. the pipe is legal for trails, but is definately pushing the limit.
5 out of 5 stars
Top 1000 Contributor
Over 7 years ago
i bought this exhaust from a different site becouse i got it in a candy blue powder coat for my ltz 400. but this is a awsome exhaust before i got this i could barley get a wheelie going in second now i can get a wheelie going in 3rd and even 4th if i pull realy realy hard. it added alot of speed and hp. i put the quiet core in it and its still loud but now legal on trail and sounds awsome. 100% happy with the outcome
TeamofZeroesOver 5 months agoLocation: Cabot, AR, USA
What is the performance difference between this and the HMF Competition pipe?
2001 Honda 400ex stock, looks dont matter. Which of the two HMF complete systems will deliver the most power? Do you know how much the two systems weigh?
Over 5 months ago
The difference between the performance and the competition exhausts mainly lie within their cores and where the gains are achieved. With the performance exhaust you will gain your horsepower and torque throughout the power band and it really shines on the top end. Essentially from ¾-full throttle you will really notice the gains with the performance. The performance exhaust features a straight through core. With the performance exhaust you are able to customize it to whatever color and tip you like (that is available for it).
The competition exhaust will come one way, black can – euro polish tip and it will come with 3 racing inserts. On a few models you can choose between elliptical muffler and round. The Competition Exhaust features a special tri-max core. By default, the largest of the 3 inserts (Stage 3) will be installed for the customer in the exhaust. There is no way to change the tips on a competition exhaust due to how the inserts work. They need the euro tip to make them work. The inserts are known as Stage 1, Stage 2 and Stage 3. Stage one can be run in the exhaust for the least sound and power gains on the machine. HMF installs the Stage 3 because most racers need the gains and don’t care that much about sound. The competition exhaust shines from the low to midrange but will still give gains across the power band. It is the exhaust for the rider who is competing and riding their machine hard or just the customer that wants every piece of horsepower/torque out of their machine.. I try to sell this exhaust to anyone who wants to get maximum gains on their machine. Most of our pro riders run this exhaust.
I hope this answers your question. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
The reason I'm asking is because In this photo the headers are one pipe and on my quad they split into 2.
Over 10 months ago
The image is a generic image supplied by the manufacturer for reference only. It may not be displaying the exact part for your bike. 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 for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
My kawasaki 450r with the exhaust and programed is 90 hp with this exhaust will it be close to what I'm making now
Top 1 Contributor
1 year ago
The internal combustion engine is very simply put a basic air pump. The more air/fuel you can pass through the intake and exhaust from the motor, the more power you will make. HP gains are very subjective to gauge on any one or combination of performance parts. Things like the age of the motor, the tune of the air fuel ratio, the altitude, etc will all have an effect on PEAK HP numbers. Many performance products will not increase your PEAK HP, but rather move the HP to a different RPM range than the stock motor.
Will this exaust fit my 2013 Honda Rancher 420 AT IRS?
I've never seen a complete system that will fit my rancher but the site said it would. I just want to be sure before I purchase anything. Also, how much work is involved in installing this system on my quad. Will performance increase a lot if this works for my quad?
Top 1 ContributorExpertMotoSport Staff
1 year 6 months ago
Unfortunately, I am unaware of any company currently offering a full system for the 2013 Honda Rancher 420 4x4 AT. There are slip-on's available which are easy to install by removing the old muffler and bolting on the aftermarket one in its place. An aftermarket slip-on will provide noticeable power gains through out the entire RPMs. They are model specific so be sure to profile the make/year/model correctly so we can be sure to send you the correct exhaust. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
LANDMINE1 year 6 months agoLocation: bowdoin Maine 04287
Will I need a efi power programmer and can I use one with this exhaust system?
MotoSport StaffExpertTop 1 Contributor
1 year 6 months ago
Yes, typically after installing an aftermarket complete exhaust system you will need a EFi programmer. I would recommend the HMF Dobeck EFI Tuning Box for your 2011 Yamaha Raptor 700 which you can find here: http://www.motosport.com/atv/hmf-dobeck-efi-tuning-box
vanco322 years 4 months agoLocation: Jackson, OH 45640, USA
What jet size does HMF reccommend for this series exhaust? Also do they reccommend removal of airbox lid for betterflow. I have all stock honda 250x?
What jet size should I use with the HMF exhaust on 250x 2011 model. also do I drill the airbox or remove lid for better flow.
Right now as all stock, my quad backfires of pops a lot on deceleration.
2 years 4 months agoLocation: Portland, OR, USA
Depending on your location and elevation the jetting will vary. Also deciding to remove or leave the air box lid installed will have an effect on jetting specs. Typically removing the airbox lid can lead to a little additional power due to the increased airflow, but if you are riding in wet or dusty conditons, the air filter can become contaminated much quicker. For the proper jetting specs it is recommended to contact the exhaust manufacturer directly or to purchase a jet a kit with a jetting guide to help get the bike jetted correctly. We do carry the Moose Stage 1and Stage 2 jet kit that will help jet your 2011 TRX250X properly for your location.