FMF Factory 4.1 titanium muffler combined with the titanium Megabomb 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 Megabomb 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 Titanium Megabomb Header The FMF Megabomb header is yet another testament to the continued dedication of FMF to developing the best performing motorcycle exhaust components. The FMF Megabomb header is designed with a unique midsection, comparable to the Powerbomb header, that provides improved power across the power range. The unique design of the Megabomb header allows for better low end torque similar to a long header while also improving top end power much like a short header. Although the FMF Megabomb header offers the advantages of a long header, the design of the Megabomb header reduces the length and the chances of getting in the way of damage. The larger midsection of the FMF Megabomb header creates a larger surface area for sound dissipation to reduce the sound output by as much as 1.5dbs. FMF constructed the Megabomb header out of their exclusive Ti-Metal for an extreme weight savings with added durability.
"i have an 2008 wr450, once i put this kit on it made the bike come alive....way more bottom end and even a little on the top end. i did get a jet kit with the kit(makes a big difference). if your looking for more power this what you need...."
44 Years - 56 Championships - 1 Brand Every great victory is the accumulation of thousands of ordinary efforts that no one sees or appreciates. Those early mornings and long motos at the practice track, the extra miles on the road bike, the countless hours of conditioning, and the singular focus and commitment to keep advancing. That commitment inspires THOR to continually strive to advance the performance, durability, comfort and style on every piece of moto equipment they produce. With feedback and input from the best riders on earth, THOR creates products that are the result of countless hours of design and testing to ensure they dont just meet your expectations, they exceed them. Adjustable closure system with a moisture-wicking retention sleeve. Stitched-in foam elbow donut increased comfort and ensure proper positioning. Extensive vent channels improve comfort and air circulation. CE approved. Sold as a pair.
The unique attributes of the Dr. Ds step system allow for a more efficient intake stroke. It does this by resisting the reflective exhaust pulse during the intake / exhaust overlap. In plain language, the carefully tuned steps in the system allow for a lower net cylinder pressure, which gives a crisper throttle response from bottom to top. The key advantage of the Step System is improved low end response with substantial gain in the mid and top ranges. Dyno tests show a 3.6 horsepower increase at peak. The Dr. D Spark Arrestor System is designed for riders who are looking for the same extraordinary performance characteristics of the Dr. D Race System, but also need to quickly adapt the system to meet USFS spark arrestor and/or noise level requirements. The DR. D complete exhaust system is birthed from Doug Dubach, who brings years of experience to the motocross and supercross scene. DR. D constructed this complete exhaust system with an aluminum muffler in conjunction with a magnesium end cap to reduce weight and stainless steel head and mid pipe to provide long lasting durability. DR. D welds the stainless steel mid pipe to the aluminum muffler to eliminate weak points and excessive weight in the exhaust system that spring connections can cause. To create a solid mounting point DR. D uses a CNC billet hanger on the extruded aluminum muffler sleeve. The magnesium end cap on the DR. D complete exhaust system is easily removable to access the spark arrestor screen. With the spark arrestor installed the exhaust system meets USFS approval. Repacking the DR. D aluminum muffler is simple with the removable bolts on the lower end of the sleeve. The DR. D complete exhaust system includes: aluminum muffler with stainless steel mid pipe, stainless steel head pipe, USFS-approved spark arrestor.