Enduro Exhaust for Small Bikes: CRF125F and KLX110 Options
By Yoshimura R&D of America, Inc. | Published: 2026-10-18
Category: Buying Guides
Compare Yoshimura RS-9T, RS-2, and RS-12 exhausts for CRF125F, KLX110, CRF230F, and DR-Z4S. Find the right slip-on or full system for your small-displacement off-road bike.
Quick answer
For small-displacement off-road bikes, Yoshimura offers three distinct Enduro Series exhausts: the RS-9T full system for the CRF125F, the RS-2 full system for the KLX110 and CRF230F, and the RS-12 slip-on for the DR-Z4S. Your choice depends on whether you need a full system for maximum performance or a 50-state-legal slip-on for a quick power gain.
Full System vs Slip-On: What’s Right for Your Bike?
A full exhaust system replaces the header pipe and muffler, offering the largest power gains. A slip-on replaces only the muffler, which is easier to install and often retains factory emissions compliance. For small bikes like the CRF125F and KLX110, a full system can unlock significant mid-range torque. For the DR-Z4S, a slip-on like the RS-12 provides a noticeable boost without the cost or complexity of a full system.
RS-9T vs RS-2: Two Full-System Designs
The RS-9T uses a muffler profile inspired by Honda HRC factory race bikes, delivering a substantial power increase and a race-ready look. It’s designed specifically for the new CRF125F with its revised frame and EFI. The RS-2, on the other hand, is a versatile system that evolved from Yoshimura’s original TRC design. It features a diamond-shaped sleeve and a larger core for quieter operation, making it a good match for the KLX110 and CRF230F where noise is a concern.
Why the RS-12 Slip-On for the DR-Z4S?
The all-new Suzuki DR-Z4S/SM arrived in 2025, and Yoshimura developed the RS-12 slip-on to add performance without sacrificing 50-state legality. It provides a 4.1% horsepower gain at 8,000 rpm and a 2% torque increase at 4,800 rpm with the spark arrestor installed. If you don’t need a full system, this slip-on is a straightforward upgrade that keeps your bike street-legal.
Decision rules for choosing your Enduro exhaust
- Bike model match: The RS-9T fits the CRF125F (2019-2026). The RS-2 fits the KLX110 (2002-2026) and CRF230F (2003-2019). The RS-12 slip-on fits the DR-Z4S/SM (2025-2026). Check your bike’s year and model before ordering.
- Performance goal: Choose a full system (RS-9T or RS-2) for maximum power and torque gains. Choose the RS-12 slip-on for a simpler, cheaper upgrade that still adds noticeable power. Full systems cost more but deliver more; slip-ons are easier to install.
- Noise and legality: The RS-2 is quieter than many aftermarket systems thanks to its large core and packing volume. The RS-12 is 50-state legal with the spark arrestor installed. The RS-9T is designed for off-road use and may not be street-legal everywhere. If noise or legality is a concern, the RS-2 or RS-12 are better choices.
Product facts
- CRF125F 19-26 RS-9T Stainless Full Exhaust, w/ Stainless Muffler: The RS-9T full system for the CRF125F uses a muffler profile inspired by Honda HRC factory race bikes and delivers a substantial power increase. This means you get race-inspired looks and performance on a modern small-displacement trail bike.
CRF125F 19-26 RS-9T Stainless Full Exhaust, w/ Stainless Muffler - KLX110/L 02-26/SUZ DR-Z110 03-05 RS-2 Stainless Full Exhaust, w/ Carbon Fiber Muffler: The RS-2 full system for the KLX110 and CRF230F features a diamond-shaped sleeve, large core, and increased muffler packing volume for quieter operation. It offers a potent power upgrade while keeping noise levels lower than many aftermarket systems.
KLX110/L 02-26/SUZ DR-Z110 03-05 RS-2 Stainless Full Exhaust, w/ Carbon Fiber Muffler - DR-Z4 S/SM 25-26 RS-12 Stainless Slip-On, w/ Stainless Muffler: The RS-12 slip-on for the DR-Z4S provides a 4.1% horsepower gain at 8,000 rpm and 2% torque increase at 4,800 rpm with the spark arrestor installed, and is 50-state legal. You get a meaningful performance boost without losing street legality or needing a full system install.
Which exhaust fits your ride?
Best for
- CRF125F owners who want race-inspired looks and maximum power: RS-9T full system
- KLX110 or CRF230F riders seeking a quieter, powerful upgrade: RS-2 full system
- DR-Z4S/SM owners wanting a simple, legal power boost: RS-12 slip-on
Not for
- Riders needing a full system for the DR-Z4S (choose a Race Series full system instead)
- Bikes not listed in the fitment (check compatibility before purchasing)
