Bernings Performance 2-1 Exhaust System for 1991-2017 Dyna

• Bernings Performance 2-1 Exhaust System
• Exhaust mounting bracket and hardware

Note: Exhaust gaskets, flanges, O2 plugs, and adapters are sold separately.

High-Performance 2-Into-1 Exhaust Design
Designed to improve exhaust flow, increase performance potential, and support more torque and horsepower on Dyna models.

Stainless Steel Construction
Built from stainless steel for durability, heat resistance, corrosion resistance, and long-term performance.

Standard and Big Bore Options
Available in standard bore or big bore configurations so riders can better match the exhaust to their motor setup.

18 mm O₂ Ports
Features 18 mm O₂ ports for easy tuning compatibility.

3.5" Muffler Body
Features a 3.5" diameter muffler body for a clean performance look, strong sound, and high-flow exhaust volume.

Standard Bore Baffle
Standard bore systems use a 2.25" perforated stainless steel baffle, making them a strong choice for stock motors and basic performance builds.

Big Bore Baffle
Big bore systems use a larger 2.5" perforated stainless steel baffle for more aggressive engine combinations that need additional exhaust flow.

Maintenance-Free Stainless Steel Packing
Uses maintenance-free stainless steel packing for durability and long-term performance without frequent repacking.

Stepped Primary Tubes
Features precision mandrel-bent and welded 1.75" to 1.875" stepped primaries that merge into a 2" welded collector.

Efficient Exhaust Scavenging
The gradual stepped primary design helps maintain exhaust velocity, improving scavenging efficiency and supporting better power delivery.

Raw or Polished Finish Options
Choose raw stainless for a race-inspired look or polished stainless for a cleaner, more refined finish.

Built for Dyna Performance Builds
A premium exhaust option for riders building a stronger, cleaner, and better-performing 1991–2017 Dyna.

Fits:

• 1991–2005 Harley-Davidson Dyna models
• 2006–2017 Harley-Davidson Dyna models

Please select the correct fitment option for your motorcycle before ordering.

Note: Standard Bore is ideal for stock motors or simple bolt-on builds, while the Big Bore option is designed for built motors with higher compression, ported heads, headwork, big bore kits, and more aggressive engine combinations.

Always confirm your exact year, model, engine setup, exhaust sensor requirements, tuning setup, and clearance before installation.

What does the Bernings Performance 2-1 Exhaust System do?
This exhaust is designed to improve exhaust flow, support more torque and power, and give your Dyna a clean performance-inspired look.

What models does this exhaust fit?
This system fits 1991–2005 and 2006–2017 Harley-Davidson Dyna models. Be sure to select the correct fitment option.

What finish options are available?
This exhaust is available in raw stainless or polished stainless.

What is the difference between standard bore and big bore?
Standard bore is best for stock motors or simple modifications like intakes and cams. Big bore is designed for built/modified motors with higher compression, ported heads, headwork, big bore kits, and more aggressive engine setups.

Should I run big bore on a stock motor?
Big bore is not recommended for stock motors because it may cause low-end power loss.

What size is the muffler body?
The muffler body is 3.5" in diameter.

What size baffle does the standard bore exhaust use?
The standard bore option uses a 2.25" perforated stainless steel baffle.

What size baffle does the big bore exhaust use?
The big bore option uses a 2.5" perforated stainless steel baffle.

What size are the primary tubes?
The system uses precision mandrel-bent and welded stepped primaries from 1.75" to 1.875", merging into a 2" welded collector.

Why are stepped primaries important?
Gradual stepped primaries help keep exhaust velocity up, which can improve scavenging efficiency and support better power delivery.

Is tuning required?
Professional tuning is recommended to get the best performance and proper fueling from this exhaust system.

Is professional installation recommended?
Yes. Professional installation is recommended to ensure proper fitment, clearance, exhaust sensor setup, hardware torque, and tuning.