2 STROKE EXHAUST SYSTEM BUYERS GUIDE

2 STROKE DIRT BIKE PIPE BUYERS GUIDE

Two-stroke dirt bikes aren’t coming back because they never went away. Same goes for the companies that offer exhaust systems. There are at least a dozen that have been in business for a very long time, and they offer a wide variety of products fitting both modern bikes and vintage models.

If you’re searching for a certain bike manufacturer, each company’s website will show you whether it builds a system for that bike. For example, FMF and Pro Circuit cover a wide swath of machines (e.g., Beta, Gas Gas, Husaberg, Honda, Husqvarna, Kawasaki, KTM, Suzuki, Yamaha and TM for Pro Circuit). In contrast, Bill’s covers Honda, Husaberg, HQV, Kawasaki, KTM, Suzuki and Yamaha. Enjoy this 2 stroke buyers guide.

DIRT BIKE BUYER GUIDES // FULL ARCHIVE

PRO CIRCUIT WORKS 2 STROKE EXHAUST PIPE

The Pro Circuit Works Pipe is a performance-oriented expansion chamber developed with direct ties to factory race teams and an in-house dyno team. Pro Circuit hand-welds and then pounds the seams on every works pipe to target both increased torque and additional power. The Works pipe features an unplated, oiled metal finish for its most popular two-stroke exhaust system. It features reinforced mounting brackets for durability and offers unparalleled performance and power for every two-stroke application. Increased horsepower and torque gains will quickly be noticed across the entire rpm range. The unplated, oiled metal finish requires some maintenance but really gives your bike that works look.

2001 Kawasaki KX125 Pro Circuit Works pipe
This Pro Circuit Works pipe is mounted on Blake “Bilko” Williams’ 2001 Kawasaki KX125.
  • Material: Stamped AKDQ carbon steel
  • Weight: 5.0 lb.
  • Price: $306.95-$317.95
  • Contact: www.procircuit.com

PRO CIRCUIT PLATINUM PIPE 

The Platinum pipe is equipped with the same performance gains as the Works pipe but targets riding in extreme weather conditions. It is constructed of AKDQ high-quality carbon steel and includes a nickel-plated finish to reduce pipe maintenance and to help protect the chamber against the elements. The Platinum pipe also features hand-welded and pounded seams and reinforced mounting brackets and stingers for increased durability.

  • Material: Stamped AKDQ carbon steel
  • Weight: 5.1 lb.
  • Price: $306.95-$317.95
  • Contact: www.procircuit.com

PRO CIRCUIT PLATINUM 2 HEAVY DUDY OFF-ROAD 2 STROKE PIPE

This is Pro Circuit’s heavy-duty, off-road-targeted expansion chamber that is beefier and more durable than its straight moto pipes. It’s constructed of heavy-duty, 18-gauge metal for increased protection from rock or crash damage. The Platinum 2 pipe is platinum-plated to protect it and has been designed to offer a stronger power gain in the low to midrange, where the off-roader needs increased tractability.

FMF RACING FACTORY FATTY 2 STROKE EXHAUST

The Factory Fatty is FMF’s bare steel expansion chamber that is a throwback to the works or cone pipe once used by factory teams. Devoid of paint (or any plating), the Factory Fatty is shaped after hours of dyno time and field testing with racing teams. It is then molded into an exhaust system that both broadens the power and gives the power the character that each individual machine demands. Each system features hand-pounded seams for smooth flow transitions.

The FMF Factory Fatty pipe was used on a Dirt Bike Yamaha YZ250 project bike.
  • Material: Lighter-than-stock 20-gauge steel is used for the body of the pipe, while 19-gauge steel is used for the header portion.
  • Includes: Header O-rings are included on most pipes.
  • Weight: 5 lb.
  • Price: $289.99-$299.99
  • Contact: www.fmfracing.com

FMF RACING FACTORY FATTY REV EXHAUST

The FMF Rev pipe focuses its power delivery in the middle and upper rpm of the powerband. If you’re running out of power up top, want more time between shifts and do a lot of deep berm or sand riding, the FMF Rev is your pipe of choice. FMF Racing’s Tru-Flo stamping process ensures a perfect fit and optimum performance.
Dyno and track tested for every application.
  • Material: Lighter-than-stock 20-gauge steel is used for the body of the pipe, while 19-gauge steel is used for the header portion.
  • Includes: Header O-rings are included
  • Weight: N/A
  • Price: $289.99

FMF RACING GOLD SERIES FATTY PIPE

The Fatty is FMF’s branded two-stroke system and has been a staple for over three decades. It’s a carbon steel system that has gone through FMF’s Tru-Flo stamping process for a proper fit and performance specs that target a broad powerband. The nickel-plated finish enhances durability, and it can be used with an FMF or stock silencer.

This FMF Gold Series Fatty pipe is mounted to Dirt Bike’s 2002 Honda CR250 project bike.
  • Material: Carbon steel
  • Includes: Header O-rings
  • Weight: 5.2 lb.
  • Price: $249.99
  • Contact: www.fmfracing.com

FMF RACING GOLD SERIES GNARLY HEAVY DUDY PIPE

The FMF Gnarly pipe is designed for the off-roader looking for a tough system. It improves the power curve where the rider needs it, offering a stronger flow of bottom power. Originally designed for the Suzuki off-road team who needed a more durable chamber for the brutal GNCC circuit, it’s made from thicker 18-gauge steel, is nickel-plated and has a longer header section that helps enhance the roll-on power needed for nasty terrain.

1996 Kawasaki KX250 FMF Gnarly pipe
This FMF Gnarly pipe is installed on a 1996 Kawasaki KX250 project bike.
  • Material: 18-gauge steel
  • Includes: Header O-rings
  • Weight: 5.7 lb.
  • Price: $299.99
  • Contact: www.fmfracing.com

SRT PRO-FLO 2-STROKE PIPE

SRT Off-Road is a huge supporter of off-road, both in racing and in focused products. Its Pro-Flo exhaust pipe is designed to be more durable than the stock chamber, yet offers smooth, consistent power. It’s made from 18-gauge carbon steel, is nickel-plated and comes with two O-rings for the header. This exhaust pipe is a beefy unit, weighing more than the stocker. SRT designed it to be tough but understands that if you make a pipe too stout, a blow that won’t compress it will actually tear the frame tabs right off the machine.

Check out a test of the SRT Pro-Flo 2 -stroke pipe on a KTM 300 XC-W TPI.

DEP FACTORY FINISH 2 STROKE EXHAUST

DEP 2 stroke pipes are produced from high quality CR1 grade, mild steel material. Ranging from 0.9-1.2mm, depending on the model and purpose. The 2 stroke stampings are produced through our own deep drawer process, using CNC cylinder mounts, in-house laser cut mounting brackets and fabricated with high-quality TIG and MIG welding. All models are available in the bare metal factory finish and nickel finish. Our 2 stroke pipes have been designed to improve performance over the OE pipe with in-house DYNO and track testing.

  • Material: CR1 grade mild steel
  • Weight: N/A
  • Price: $196.38-218.21
  • Contact: www.deppipes.com

DEP NICKEL EXPANSION PIPE

The nickel-plated DEP Expansion pipe mirrors the performance of the Factory Finish system. It has a CNC-machined manifold; TIG- and MIG-welded, stamped, mild steel body parts; and will fight off abuse far better than the uncoated Factory Finish.

  • Material: CR1 grade mild steel
  • Weight: N/A
  • Price: $223-$240.03
  • Contact: www.deppipes.com

DEP ARMORED ENDURO

Nickel-plated and equipped with thicker skin, the Armored Enduro exhaust is strong and fights to ward off the hits and smashes that occur when riding off-road. It has a CNC-machined manifold, power gains over stock and has been tested on the World Enduro circuit.

  • Material: 1.2 mm CR1-grade mild steel
  • Weight: N/A
  • Price: $250.94
  • Contact: www.deppipes.com

SCALVINI 2 STROKE EXPANSION PIPE

The Scalvini expansion is a true cone pipe that can trace its DNA back to the works pipes used by factory two-strokes and is built in Italy. Scalvini hand-builds each pipe to mirror the bottom performance of stock with a harder mid hit and a stronger pull on top. Each system comes with an ID tag and features a CNC-machined exhaust flange and double-wall mounting brackets for strength.

This Scalvini 2 stroke cone pipe is mounted on a Husqvarna TX300. 

Check out the complete archive of Scalvini 2 stroke exhaust tests.

BILL’S PIPES MX2 CONE 2 STROKE PIPE

For riders looking for the same performance gain as the MX2 pipe but in a cone look, this pipe is an additional $125.00 ($374.95 total). The MX2 Cone Look pipe is a stamped unit with welding lines added that are reminiscent of the old works pipes.

Yamaha YZ250 2-stroke Bill's dirt bike pipe
This Bill’s cone pipe was tested on our Yamaha YZ250 project bike.

BILL’S PIPES MX2 WORKS 2 STROKE EXHAUST

Bill’s Pipes has been building expansion chambers for over three decades. Its MX2 Works pipe is made from 19-gauge carbon steel, features broad-based power gains, is hand-welded for a proper fit, and is made in the USA.

This Bill’s 2 stroke pipe was mounted on our GasGas MC250 build which turned out looking great.

BILL’S PIPES MX2 NICKEL EXHAUST

The MX2 Nickel pipe from Bill’s is identical to the MX2 Works Pipe but is double nickel-plated for improved durability and looks. It’s made from 19-gauge carbon steel, features broad-based power gains, is hand-welded for a proper fit, and is made in the USA.

BUD/HGS FACTORY 2 STROKE PIPES

Developed by Bud Racing and made by HGS (the supplier to top European teams), Bud/HGS exhaust pipes target stronger low-end response coupled with smoother overall power delivery. The goal is tractable and usable power, and the deep stamping process was developed on the tough European circuits where controllable power is key.

  • Material: Raw metal finish, 1/32 steel
  • Weight: 4.41 lb.
  • Price: $289.00 and up
  • Contact: www.budracing-usa.com

DG PERFORMANCE VINTAGE 2 STROKE PIPES

DG specializes in vintage, Evo and Revo two-stroke exhaust systems. Availability includes the most popular two-stroke models from the ’70s and ’80s, as well as many from the ’90s. All are designed to match the original manufacturers’ specifications in performance and fit. DG pipe work with the stock hardware and silencer, although DG also manufactures silencers. The pipes come in a raw finish with a removable anti corrosion coating.

  • Material: 19-gauge steel
  • Weight: N/A
  • Price: $349.00 and up
  • Contact: dgperformance.com

DIRT BIKE BUYER GUIDES // FULL ARCHIVE

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