21 Sidewinder 2-Into-1 Exhaust for Harley-Davidson Sportster (1986–2020+)

21 Sidewinder 2-Into-1 Exhaust for Harley-Davidson Sportster (1986–2020+)

$995.00
The 21 Sidewinder is a handcrafted 2-into-1 stainless steel exhaust for 1986+ Harley-Davidson Sportsters, featuring a smooth merge collector, resonated muffler, ceramic-coated piping, optional O2 bungs, and an integrated flange kit for performance-focused installation.
Kinetic Motorcycles

Bike Details

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High Precision Motorcycle Parts
Product Information

The 21 Sidewinder Sportster Exhaust refines the original Sidewinder with a smooth 2-into-1 merge collector and a resonated 3” stainless muffler.

This design improves exhaust scavenging, increases horsepower, and delivers a deep, aggressive tone without excessive drone.

Handcrafted from mandrel-bent 304 stainless steel and internally ceramic-coated, the system offers superior durability, corrosion resistance, and reduced radiant heat.

Designed for all 1986+ Sportster models, it works with mid, forward, and rear-set controls. Optional O2 bungs support EFI bikes, while the integrated flange kit replaces fragile OEM snap-ring hardware for a cleaner, more reliable installation.

Specifications
Material
Mandrel-bent 304 stainless steel
Coating
Internal ceramic coating
Diameter
1.75" → 2" → 3" muffler outlet
Muffler
Resonated stainless steel muffler
O2 Sensor Bungs
Optional (EFI 2007–2020+)
Integrated Flanges
Included
Controls
Mid, forward & rear-set controls
Production Time
2–4 weeks (made to order)
Features
Material
Mandrel-bent 304 stainless steel
Coating
Internal ceramic coating
Diameter
1.75" → 2" → 3" muffler outlet
Muffler
Resonated stainless steel muffler
O2 Sensor Bungs
Optional (EFI 2007–2020+)
Integrated Flanges
Included
Controls
Mid, forward & rear-set controls
Production Time
2–4 weeks (made to order)
Fitment
Iron 883
Nightster
Forty-Eight
Seventy-Two
Roadster
1200 Custom
Fitment Details:
  • Fits Harley-Davidson Sportster models (1986+)
  • Compatible with all 883 & 1200 trims
  • Works with forward, mid, and rear-set controls
  • EFI bikes (2007–2020+) require O2 bungs unless using eliminators
Why Choose
Refined Sidewinder design with smoother merge collector
Resonated muffler for powerful yet controlled sound
Stronger horsepower and torque gains
Ceramic-coated internals reduce heat buildup
Durable TIG-welded stainless steel construction
Versatile fitment for all Sportster control setups
FAQs
Will this exhaust fit my Sportster?

Yes, it is designed for all 1986+ Harley-Davidson Sportster models.

Do I need O2 bungs?

EFI Sportsters from 2007–2020+ require O2 bungs unless using eliminators.

What makes the 21 Sidewinder different?

It features a resonated muffler for more refined sound tuning while preserving Sidewinder-level performance.

What’s the production time?

Typical turnaround time is 2–4 weeks.

Designed & Built in the USA

Every Kinetic product is designed and manufactured in the United States. Keeping our work in-house allows us to control quality, refine fitment, and stand behind every part we make.

A Decade of Hands-On Experience

Founded in 2013. A decade of machining, installing, riding and refining components on real bikes — not just in a lab. That experience shows in the quality of every part we ship.

Designed by Riders & Builders

Every product is shaped by hands-on building and riding experience, with practical decisions made where it matters most.

Innovation Meets Passion

Made in the USA

Founded in 2013 by Mike Le, Kinetic Motorcycles was built on a simple belief: motorcycle parts aren't generic hardware — they're personal. Every product begins as an original idea, designed by Mike and developed entirely in-house.

We don't rely on templates or outsourced shortcuts. Each part is shipped by hands-on fabrication experience and time spent riding, testing, and refining. Whether you're dialing in a daily rider or building something truly your own, our focus is the same — create parts that feel intentional, functional, and worthy of your motorcycle.

Innovation Meets Passion

What Our Customers Say

Really happy with the product. Took a while to get my order but they were out of the spark plug cables I ordered. I had to email and inquire what the deal was. They were super helpful once I initiated communication. Would have been cool to get some swag or something since they took so long. But the relocator is great. I really love it. And they responded promptly once I reached out to them. Their customer service is truly fantastic.

Brian Hopkins
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I had some questions on some bars, so I DMd them on Instagram. The dude I talked to was super helpful. I purchased the shirt because of his response. I’ll rep the brand due to the customer service.

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