If you’re looking to amp up your Kawasaki KFX 450R from 2007 to 2014, the Big Gun EXO Series Full System is a game-changer. I’ve had my fair share of aftermarket mufflers, but this one really stands out. It’s designed for those of us who crave performance without sacrificing that deep, throaty sound that makes your ride feel alive.
The EXO Series isn’t just another pretty face; it’s built from the ground up to handle the demands of bigger, more powerful sport ATV engines. The hexagon-shaped aluminum muffler isn’t just for looks—it actually increases volume. And let’s be honest, who doesn’t want a little extra rumble when you hit the throttle? The sound is loud enough to turn heads, but it’s not obnoxious. You get that deep tone that feels just right.
One of the standout features is the stamped 304 stainless steel coned inlet. This isn’t just about aesthetics; it plays a huge role in boosting volume and performance. Plus, the lightweight brushed aluminum construction means you’re not adding unnecessary weight to your ride. And for those who like to push their machines, the TIG welded reinforced muffler brackets are a nice touch—no worries about it falling apart when you hit those rough trails.
What really impressed me were the power gains. You can expect significant boosts in both horsepower and torque, which makes a noticeable difference when you’re climbing hills or tearing through mud. And if you’re concerned about spark issues, the removable screen-type spark arrestor is included, so you can ride confidently without worrying about fire hazards.
Every piece of this system is handmade right here in the USA, which shows in the quality. Plus, it comes with a 1-year limited manufacturer’s warranty, so you know you’re covered. If you’re serious about getting the most out of your KFX 450R, the Big Gun EXO Series Full System is definitely worth considering.
Other Part Numbers:
Big Gun Exhaust #624741
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Big Gun Exhaust was founded in 1997 by former professional motocross racer, Mike Young, Jr., a three-time winner of the AMA National Four-Stroke Championship. He knew what it took to win the races and used that knowledge to start a business of manufacturing high-performance, quality exhausts for the motocross and sport ATV market, and eventually the side-by-side and street markets as well.
New Ownership, New SuccessAfter more than a decade of success under Young, Big Gun Exhaust was sold to a new owner in the hopes of facilitating further growth. In 2010, the company changed ownership once more, which called for tremendous restructuring in an effort to improve the brand. The new management and sales team helped rebuild the Big Gun Exhaust brand and streamline production and manufacturing processes under one roof in Corona, California. The more efficient manufacturing process resulted in a new level of success never before seen with Big Gun. Today, Big Gun Exhaust boasts one of the largest four-stroke exhaust product lines available and caters to the MX, Sport ATV, Utility ATV, Side-by-Side, Street, and Scooter markets.
What Makes Big Gun Exhaust Special?All quality Big Gun Exhaust products are made right here in the USA using some of the latest cutting-edge equipment, and design and production techniques. Big Gun Exhaust takes pride in having one of the fastest lead times in the industry, which has allowed it to see exponential growth in the last few years.
Big Gun Exhaust has garnered a huge customer base all around the world thanks to its emphasis on customer service and satisfaction. Its partnerships with successful race teams and riders only further solidified the brand’s dedication to competing and winning. The company’s experienced team continues to work closely with racing teams, sponsoring different motorsports events and gathering valuable data to be used in improving its product lineup.
Big Gun Exhaust’s R&D department has been tirelessly working to stay ahead of the competition and develop new innovative systems that exceed customer expectations. The successful ECO, EVO, and EXO lines of four-stroke exhaust systems have been accompanied by the premier EXO stainless series which set the bar even higher for aftermarket performance exhausts in the growing ATV and side-by-side markets.
Upgrade to Big Gun Exhaust TodayBig Gun Exhaust is one of the leading ATV, Motocross, UTV, and Side-by-side exhaust manufacturer in the USA. If you are interested in upgrading to one of its systems, look no further. Vivid Racing has a wide selection of products from Big Gun Exhaust, including exhaust tips, fuel regulators, mufflers, headers, power boxes, packing kits, snorkel kits, and piggyback modules. If you cannot find a particular part above or have questions regarding Big Gun Exhaust, please call our specialized sales team at (480) 966-3040.