FMF or Pro Circuit? Choosing the Right Exhaust for Your 2023 KTM 85 SX

FMF 025222 Factory Fatty exhaust pipe & the Pro Circuit 0761985 Works exhaust pipe comparison:

When it comes to squeezing the most out of a two-stroke engine, upgrading the exhaust system is often the first step for many riders. The 2023 KTM 85 SX, already a powerhouse in stock form, provides an excellent starting point for exploring performance gains. Its smooth, linear power delivery makes it a favorite among young riders, and any upgrades you make can easily translate to its Husqvarna TC 85 and GasGas MC 85 siblings. But when it comes to aftermarket exhausts, the age-old debate arises: FMF or Pro Circuit? In this blog, we’ll break down these two leading options to help you decide which is best for your riding style and goals.

 

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Unboxing both the FMF and Pro Circuit systems reveals their distinct personalities. The FMF Factory Fatty, with its raw metal finish and vibrant rainbow welds, exudes a bold factory-racer aesthetic. On the other hand, the Pro Circuit Works Pipe, with its meticulously hand-welded seams and evolving patina, offers a refined, almost vintage appeal. Both silencers—the FMF Powercore 2 and the Pro Circuit R-304—are compact, lightweight, and designed to deliver enhanced performance alongside a deeper, throatier exhaust note.

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Power Delivery: A Head-to-Head Comparison of FMF Factory Fatty Pipe & the Pro Circuit Works Pipe

Low-End Performance:

• The FMF Factory Fatty takes the lead in low-end power delivery. Its increased torque provides a noticeable boost in acceleration out of corners, making it easier for riders to power through berms and get the bike hooked up.

• While the Pro Circuit Works pipe doesn't have the same low-end grunt as the FMF, it still offers a solid improvement over the stock pipe. The focus here is more on mid-range punch and top-end pull.

Mid-Range Performance:

• Both systems significantly enhance the mid-range, but with different characteristics. The FMF provides a smoother, more linear power delivery, making it predictable and easy to control. This is ideal for riders who are still developing their throttle control and prefer a more forgiving powerband.

• The Pro Circuit, on the other hand, delivers a more aggressive hit in the mid-range. This translates to a thrilling surge of acceleration and a feeling of raw power that experienced riders will appreciate. It's particularly advantageous for holeshots and quick bursts of speed."

Top-End Performance:

• Both exhausts deliver impressive top-end power, enabling riders to hold gears longer and achieve higher speeds. The FMF offers a smooth, consistent pull across the entire rev range, while the Pro Circuit stands out with a slight edge in over-rev. This extra power can be a game-changer for clearing jumps, tackling whoops sections, or securing the holeshot.

Exhaust Note - Sound:

• Both systems produce a distinctive two-stroke sound that's sure to turn heads at the track. The FMF Powercore 2 Shorty Silencer has a deeper, more refined tone, while the Pro Circuit R-304 Shorty Silencer delivers a sharper, more aggressive bark. Ultimately, sound preference is subjective, but both options enhance the auditory experience of riding the KTM 85 SX.

Reliability and Build Quality

• FMF and Pro Circuit are renowned for their durable, high-performance exhaust systems, crafted to excel in motocross. With top-tier materials and meticulous welds, both brands showcase exceptional craftsmanship, making it tough to choose between these industry leaders.

Aesthetics:

• Both pipes radiate undeniable coolness, each with its own distinct style. The FMF pipe features a raw, modern "factory" look, showcasing edgy and contemporary design. While the Pro Circuit Works Pipe stands out with its timeless, hand-welded craftsmanship that embodies the classic works pipe look.

In conclusion, choosing between FMF and Pro Circuit ultimately comes down to the rider’s preferences, skill level, and riding style. For those who value enhanced low-end torque and smooth power delivery, the FMF Factory Fatty paired with the Powercore 2 Shorty silencer is an excellent option. Meanwhile, advanced riders seeking a more aggressive mid-range hit and a sharper exhaust note will appreciate the performance edge offered by the Pro Circuit Works Pipe and R-304 Shorty silencer.

Shop Pro Circuit:

 

Thank you for reading the blog! If you're looking for something else for your KTM 85 SX, be sure to check out other items available. Thanks!