FMF Megabomb Stainless Steel Header and Mid-Pipe 045661 for KTM 500 XCF-W and Husqvarna FE 501

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 1.5dB. The Megabomb technology is revolved to produce more low end to mid range gains as well as broadening out the mid to top end power gains over stock. The Megabomb is best used for Motocross/Supercross and GNCC style trails. Used by Factory Teams, the Megabomb is the next level technology you can have today.

Upgrade your motorcycle’s exhaust performance with the FMF Megabomb Stainless Steel Header and Mid-Pipe, manufacturer part number 045661 and vendor part number 79-045661. Designed for riders who demand stronger, broader power delivery, this Megabomb system works with an existing FMF Racing slip-on muffler to help increase horsepower across the powerband while maintaining a race-ready exhaust configuration.

The FMF Megabomb header is engineered to improve low-end and mid-range response while extending power gains into the mid- to top-end range. Its tuned design can provide substantial performance increases throughout the powerband and may deliver up to a 3 horsepower gain when paired with a compatible FMF Racing slip-on. The system also helps reduce exhaust noise levels by as much as 1.5 dB compared with a standard configuration.

Built from stainless steel for durability in demanding riding conditions, the Megabomb is well suited for motocross, Supercross, and GNCC-style trail riding. Factory-team-inspired technology gives riders a practical way to enhance throttle response and overall engine performance without replacing the complete exhaust system. Professional installation and verification of exhaust fitment are recommended before use.

Fitment includes the 2020–2023 KTM 500 XCF-W and the 2020–2023 Husqvarna FE 501. Confirm your motorcycle model, year, and existing FMF Racing slip-on compatibility before ordering.

Features:

• FMF Megabomb header and mid-pipe designed for increased performance
• Stainless steel construction for durable off-road and race use
• Helps increase low-end and mid-range power while broadening mid- to top-end gains
• Can provide up to a 3 horsepower increase when used with a compatible FMF Racing slip-on
• May reduce exhaust noise levels by as much as 1.5 dB
• Ideal for motocross, Supercross, and GNCC-style trail riding
• Fits 2020–2023 KTM 500 XCF-W models
• Fits 2020–2023 Husqvarna FE 501 models
• Brand: FMF
• Manufacturer part number: 045661
• Vendor part number: 79-045661

Fitment:
2020 Husqvarna FE 501
2020 KTM 500 XCF-W
2021 Husqvarna FE 501
2021 KTM 500 XCF-W
2022 Husqvarna FE 501
2022 KTM 500 XCF-W
2023 Husqvarna FE 501
2023 KTM 500 XCF-W