If you're looking to get a little more out of your Yamaha Grizzly 550, the Big Gun TFI Power Box is worth a serious look. This isn't just another add-on; it's a game changer for anyone who wants to enhance their ride from 2009 to 2015. I’ve had my share of experiences with different performance upgrades, and trust me, this one packs a punch.
First off, let’s talk about the horsepower. This little box boosts your power and improves throttle response in a way that you can actually feel. Whether you’re climbing hills or just cruising through trails, the difference is noticeable. Plus, it installs in just a few minutes—no complicated setups or need for a computer to tweak your EFI settings. Just plug it in and go.
What I really appreciate is the plug-in technology. It doesn’t mess with your stock ECU map, so you can keep that factory reliability while still squeezing out some extra performance. And if you’ve got an aftermarket exhaust, this is highly recommended. It works seamlessly with those setups, giving you the best of both worlds.
Another neat feature is the integrated faceplate buttons. They let you make quick adjustments on the fly, which is super handy when you’re out on the trail and want to fine-tune your ride. And hey, if you’re worried about durability, it comes with a one-year limited warranty, so you can ride with confidence.
Just a heads up, though—this product isn’t ARB/CARB compliant, so if you’re in California, you’ll need to look elsewhere. But for everyone else with a Yamaha Grizzly 550 from 2009 to 2015, this is a fantastic upgrade that can really transform your experience. Trust me, once you feel the difference, you’ll wonder how you ever rode without it.
Fitment:
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Make Vehicle | Model | Year |
|---|---|---|
|
2009-2014 Yamaha YFM550FG Grizzly FI 4WD |
YFM550FG Grizzly FI 4WD | 2009-2014 |
|
2009-2014 Yamaha YFM550FGP Grizzly FI 4WD EPS |
YFM550FGP Grizzly FI 4WD EPS | 2009-2014 |

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.