Someone looking for a smooth quiet ride probably wouldn't be happy in a 4X4 Turbo Diesel. Having that said, you can pick and choose the type of gains you're looking for and the features that best suit you, rather then us pre-determining them for you like other companies do. Check our search by bike engine at the top of your screen to help identify what we have available for your machine. Depending on what model silencer you run with the stock pipe will determine how they work.
All of our testing is done around one of our FMF pipes, but we do build them so that they will fit up to and work with a stock OEM pipe. Expect similar gains with our silencers on a stock pipe as you would when using it with an FMF pipe. Check the fitment next to the SST pipes and silencers to make sure the fitment is correct. The newest addition to the line is the SST pipe. This pipe gives an all around power increase similar to the Fatty, yet gives it even more mid and top like the Rev without sacrificing low end.
This year we've added titanium headers to the mix. We have something to suit everyone, from someone looking for a fair priced replacement all the way to that person looking for that factory titanium header. Here are your choices to choose from and why. We offer our Hi-Flo and Powerbomb headers either in stainless steel or titanium. Our stainless steel headers offer you a lower priced header with increased durability compared to our titanium versions, because of the material and its lower costs and MIG and TIG welding.
Don't let the lower price fool you into thinking they won't perform as well as the titanium versions though. These are modeled identical to the titanium headers and use the same CNC benders to insure proper fit every time.
Since titanium is a higher grade metal, these headers are priced higher compared to our stainless steel versions. You don't get more exotic then titanium. Our Hi-Flo header is an upgrade to your stock header. We've taken the stocker header an improved it to the point that we're not drastically changing the powerband or losing power over stock. On some models, like the YZ we alter the routing so that it's tucked into the bike better so that it's less vulnerable to damage and so that you can change the oil filter without having to loosen or remove it.
The Powerbomb chamber has two functions. One it acts like a pre-muffler to knock down the sound level a bit and two increases power by increasing the rate in which the header can flow.
When the exhaust enters the chamber, it expands and then cools which causes it to contract. This expansion and contraction actually speeds up the exhaust through the header.
It also has a scavenging effect on the exhaust port, which will let a fresher air and fuel charge into the cylinder for a more efficient burn. This also creates even more power. Don't be fooled by larger diameter headers increasing power everywhere. With a loss of backpressure at the exhaust port you will lose low end power in order to gain top end. Both the Hi-Flo and Powerbomb headers increase power throughout the entire power band.
The science behind the Megabomb header may be our greatest engineering accomplishment to date. You can bolt on a Megabomb with an existing FMF Racing slip on for as much as a 3hp boost, plus the Megabomb actually reduces noises levels by as much as 1. You will see the majority of your power increases on the low to mid range as well as broadening out the mid to top end over stock.
This works great for tight woods riding, supercross type tracks or for someone looking to boost that bottom end. Keep this in mind. This is true to a certain extent until you get out of the tuning range of the motor. A cc motor will only flow so much exhaust. For more top end, add more discs and for more bottom end, run less discs with the quietcore installed. Gold Series refers to the plated finish of our pipes. All our pipes other than the SST and ATV pipes are nickel-plated, which end up turning a slight gold color over time from the temperature, hence the name.
Fatty pipes are designed to give the engine an all around power increase. We are not drastically altering the power band of the bike. This pipe will appeal to most people that are happy with the stock power band and just looking for more useable power everywhere. Our Gnarly pipes have been developed and tested for the off-roader in mind.
With thicker 18g steel construction, it will take the punishment you can throw at it. This pipe will shift and increase the power band so that it comes on sooner, pulls harder through the mid and smoothes out the high RPM surge. This was once called our Torque pipe, but it did not include the thicker steel construction. The Rev pipe is designed for that rider that keeps it wide open.
This pipe takes a little from the bottom and puts it up on top to keep it screaming. We offer this pipe for 80cc and cc's only and are recommended for higher skilled riders, as the power can be a little pipey. For outdoor high-speed tracks, this works awesome. This is probably one of the most asked questions. The rumor mill has created several very creative meanings that we dare not share. We do not necessarily look for the fastest riders as much as we look for whom we feel would be the best representatives for FMF Racing.
FMF support vehicles are always on the move. For the latest schedule, click here. This is a common question we get here at FMF Racing.
You cannot add a spark arrestor screen to any existing 2-stroke silencer. The reason for this is because all of our 2-Stroke silencers that have spark arrestors, are built into the actual core as a "Turbine Dampening System" that is welded to the core and is U.
Forestry Approved. The three silencers we offer with spark arrestors are the Turbinecore's, Q Series and the Q-Stealth's. Return any unused item within 90 days for a full refund. Start a Return Read our full Return Policy. Lowest Price, Guaranteed. Found it for less? Submit a Price Match. See what our customers are saying about us: Customer Reviews. Zilla Cash Program.
ZillaCash Silver. ZillaCash Gold. JavaScript Disabled. We have updated our Privacy Policy. Please click here to review the updates. Filters Shop By. Filter 0. Up on top end both seem on par with each other and of course both have less over-rev than the stock muffler. According to a study done in California, the comfortable sound a dirt bike should make is 96 decibels, which is more like a quiet roar.
Typically, a 2-stroke engine creates more torque at a higher RPM, while a 4-stroke engine creates a higher torque at a lower RPM. That being said, 2-stroke engines are more powerful.
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