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.
CB 421 Exhaust System – Custom Stainless Steel 4-1 for CB Motorcycles
$1,250.00
The CB 421 Exhaust System, designed exclusively at Kinetic Motorcycles, combines retro and modern styling with the reliability of contemporary engineering. Crafted from 100% stainless steel, this 4-1 exhaust is meticulously built in-house, featuring custom-integrated flanges, a 4-1 collector, and a carefully engineered muffler. Made to order with a 2-4 week wait time, the CB 421 is built for riders who appreciate custom craftsmanship and performance.
Kinetic Motorcycles
USA Designed & Made
Worldwide Shipping
High Precision Motorcycle Parts
Product Information
The CB 421 Exhaust System is designed for riders seeking both performance and distinctive styling.
Manufactured entirely in-house at Kinetic Motorcycles, the system is constructed from high-quality 304 stainless steel for durability and long-term reliability.
The exhaust blends retro and modern aesthetics, delivering a unique appearance while maintaining everyday riding dependability.
A fiberglass-packed muffler provides refined sound control, while integrated flanges ensure precise fitment. The slip-fit design between the collector and muffler allows easy installation and a clean finish.
Each system is made to order with a typical lead time of 2–4 weeks, built for riders who appreciate true custom craftsmanship.
Specifications
Material
304 Stainless Steel
Muffler
Fiberglass packed
Finish
100% TIG welded
Design
Slip-fit collector to muffler
Clearance
Passenger foot clearance
Manufacturing
Built in-house at Kinetic Motorcycles
Features
- Custom-designed and built exclusively at Kinetic Motorcycles
- Blend of retro and modern styling
- Fiberglass-packed muffler for refined sound control
- Integrated flanges for precise fitment
- 100% TIG welded construction for strength and durability
- Designed for passenger foot clearance
- Slip-fit collector-to-muffler design for easy installation
Fitment
CB Model Motorcycles
Retro Builds
Custom Builds
Fitment Details:
- Designed for various CB model motorcycles
- Slip-fit design ensures secure installation
- Made to order — typical wait time 2–4 weeks
Why Choose
Handcrafted in-house with premium materials
Distinctive retro-modern design language
Precision TIG welding for strength and longevity
Refined sound control with fiberglass-packed muffler
Engineered for fitment, function, and style
Custom-built component for serious riders
FAQs
Is this exhaust system made to order?
Yes. Each CB 421 system is made to order with a typical lead time of 2–4 weeks.
Does the system provide passenger foot clearance?
Yes. The exhaust is designed to allow passenger foot clearance.
What materials are used?
The system is built from 304 stainless steel with a fiberglass-packed muffler.
Is installation easy?
Yes. The slip-fit design between the collector and muffler allows straightforward installation.
What is the benefit of the fiberglass-packed muffler?
It helps refine exhaust tone while maintaining performance.
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.
What Our Customers Say
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.
Precision-machined and bolt-on perfect. Took 30 minutes to install and the difference is night and day.
Customer support answered my DMs within an hour. Shipping was on point, packaging was premium.
Customer Reviews
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