The Factory 4 System is FMF’s premier four-stroke exhaust.

MF has been making off-road motorcycles go faster since 1973. That’s more than 30 years of research, racing and commitment to excellence. During that time, FMF has garnered countless No. 1 plates in motocross, Supercross, GNCC and just about every field of off-road racing you can name. FMF goes racing with the goal of putting their products to the test at the highest levels of the sport.
     Since the advent of the YZ400F in 1998, FMF’s four-stroke development has been at the leading edge of performance. With new products constantly being developed for new motorcycles and ATVs, FMF is committed to offering every customer the best exhaust system on the market that suits those customers needs, riding style and wallet. The key to FMF’s success with the new breed of high-performance four-stroke motorcycles and quads is the intense research and development efforts expended to create products that improve on what is already a high performance machine.

FACTORY 4 EXHAUST SYSTEM
     FMF’s premier new four-stroke exhaust offering is the “Factory 4 System.” The Factory 4 exhaust system brings new concepts into the marketplace including some technologies FMF developed while originating their innovative street exhausts.
     Just in time for the new ’04 machines, The Factory 4 muffler uses FMF’s oval to round construction implementing military grade titanium and is offered in either a Natural or an Anodized Blue finish for the same price. Leading into the muffler is a specially formed tapered inlet. The oval shape combined with the tapered inlet allows the muffler to be routed further forward without interfering with the rear of the bike and subframe. This lowers and centralizes the machine’s center of gravity, which improves handling without sacrificing silencer volume and durability.
     While overall it is slightly longer, with its shorter rear protruding length, it is less susceptible to damage, too. Preceding the muffler is a PowerBomb titanium header and titanium mid-pipe for optimum fit and strength. The big-bore 450cc and up motors get the new “Factory Forward” PowerBomb titanium header to further centralize the weight with the optimum tuned length. Also new is FMF’s modular exhaust port flange, which offers a better seal, transmits less vibration and puts less tension on the exhaust system.
     Included at no charge is FMF’s Power-Up jet kit for optimum tuning and “remove before flight” wash plug.

TITANIUM 4 SL
A great new product from FMF also available for the ’04 and a select few ’03 machines, the Titanium 4 SL combines the light weight, durability and centralized “center of gravity” of the FMF Factory 4 systems and builds in usability and extra durability for the off-road rider. Plus, the Titanium 4 SL comes in titanium or stainless mid-pipes with corresponding price points derived from and utilizing all of FMF’s Factory 4 technology while retaining the stock header.
     The Titanium 4 SL (slip-on) includes a muffler, mid-pipe and complete mounting hardware and can be used with OEM stock or an FMF header. The Titanium 4 SL also is available with the choice of Natural Titanium or the Anodized Blue Titanium finish along with the same distinctive interchangeable end cap as found on the new Factory 4 systems.

TITANIUM 4
As with the other titanium models already mentioned, The Titanium 4 full racing exhaust system will give the rider the huge weight savings of titanium plus offer performance traits that have been gleaned from FMF’s associations with various factory motocross teams. This set-up is available for ’03 and previous machines. The Titanium 4 is fully tunable with modular end caps that will allow for easy changes and let the tuner/racer effortlessly shape the powerband of his machine.
      Three modular end caps are available: the standard Hi-Flo 2-inch, a 1-3/4-inch and 1-1/2-inch end caps for traction control and a spark arrestor module for forest legal applications. The three-piece design features a titanium (or stainless steel) header system, a titanium (or stainless steel) mid pipe and the Titanium-4 muffler itself. With the various headers offered, FMF gives the racer the option of four totally different header systems, all with different price points. There is the standard Hi-Flo header offered in both titanium and stainless steel construction, which is joined by the patented PowerBomb header, which is also offered in both titanium and stainless steel construction.
     Thousands of hours of both track and dyno time have been spent tuning the Titanium-4’s power delivery. Power gains have been averaging out at just under 20 percent and the weight savings is huge! In most cases the Ti-4 is 50 percent lighter than stock!
     The Titanium 4 Muffler is offered in two lengths. The standard 14-inch unit offers the greatest power gains at the expense of a louder sound level. The longer 17-inch unit has a bit less peak power, trading it for increased low-end throttle response and a more respectable reduced sound level.
     FMF has it all, great products for the off-road, motocross or ATV enthusiast, all with the quality, fit and finish you’ve come to expect from FMF and a racing pedigree unsurpassed for excellence in the powersports world. Whether your customers are looking for high performance gains for a racing machine or just want a bit more kick for their four-stroke trail bike or ATV, FMF has an exhaust system to fit. Contact your Parts rep to stock up on all these great products from FMF today.

Designed for 2003 and earlier machines, the fully tunable Titanium 4 full race exhaust system gives riders huge weight savings plus additional performance traits.

The Titanium 4 SL is light weight, durable and features the same centralized “center of gravity” as the FMF Factory 4 systems, with added durability for the off-road rider.

The Titanium 4 SL includes a muffler, mid-pipe and complete mounting hardware.