FMF Factory Fatty Pipe 025090 — KTM 85 SX / 105 SX / 105 XC 2006-2017

Product Description

The FMF Factory Fatty Pipe is the gold standard for riders looking to achieve that legendary "works" bike performance. Designed to replicate the iconic cone pipes used by professional factory teams, this pipe combines elite-level craftsmanship with advanced material engineering to give your KTM the edge it needs on the track or trail.

The Factory Fatty is engineered to broaden and smooth out your power curve, providing noticeable gains across the entire power band. Whether you need more grunt down low, stronger mid-range pull, or increased over-rev at the top, the Fatty delivers. By using lighter 20-gauge steel for the body and 19-gauge steel for the header, FMF has created a durable yet lightweight exhaust that optimizes flow transitions for maximum engine efficiency.

Top Features: FMF Factory Fatty Pipe

• Works-Style Performance: Replicates the power characteristics and craftsmanship of professional factory team exhausts.
• Broadened Power Band: Smooths out delivery while boosting low-end, mid-range, and top-end power.
• Premium Construction: Built with 20-gauge steel body and 19-gauge steel header for the perfect balance of weight and durability.
• Hand-Pounded Seams: Meticulously crafted seams ensure smooth flow transitions for optimal exhaust scavenging.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Will this pipe work with my stock silencer?
A: While the FMF Factory Fatty is designed to bolt onto the stock mounting points, we highly recommend pairing it with an FMF silencer for the best performance gains and perfect fitment.

Q: Does this pipe require jetting changes?
A: Yes. Because this pipe increases airflow through the engine, you will likely need to adjust your carburetor jetting to prevent a lean condition and ensure optimal power.

Expert Pro-Tip: When installing a new 2-stroke exhaust, always use a fresh exhaust gasket and high-temp silicone at the cylinder-to-pipe junction. Even a tiny air leak at the exhaust flange will cause your bike to run hot and lose that crisp throttle response you’re looking for.

Recommended Pairings:
o KTM 2-Stroke Performance Parts
o Premium Motorcycle Chemicals
o MX Off-Road Chains

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. Every order ships fast from our Central Florida location.

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