Buy Used Mugen S1 Bucket Seats Europe – Part No. 81100-XG8-K1S0

Looking to buy used Mugen S1 bucket seats in Europe? This genuine Mugen S1 Full Bucket Seat, part number 81100-XG8-K1S0, is a rare performance seat designed for enthusiasts looking to add authentic Mugen motorsport character to a Japanese performance car, track build, restoration, or collector vehicle.

The Mugen S1 is a lightweight full bucket seat developed around strong driver support and a low seating position. Mugen’s original documentation identifies the shell as a fiberglass and vinyl-ester resin composite, with a published main-seat weight of approximately 5.8 kg excluding the seat rails.

This listing is for a USED Mugen S1 bucket seat, making it an opportunity to source a discontinued and increasingly difficult-to-find genuine Mugen performance interior component.

Product Highlights

• Genuine Mugen S1 Full Bucket Seat
• Part Number: 81100-XG8-K1S0
• Used condition
• Original Mugen performance component
• Lightweight composite shell
• Approximately 5.8 kg excluding mounting rails
• Full bucket-seat design
• Deep driver-supporting side bolsters
• Low seating position
• Designed for performance and motorsport-oriented applications
• Rare and collectible Mugen interior component
• Suitable for Japanese performance-car builds, restoration projects and track-focused vehicles
• European sales and shipping available

Specifications

Mugen’s original catalog specifically identifies 81100-XG8-K1S0 as the S1 Full Bucket Seat and lists dedicated seat-rail components separately.

Genuine Mugen S1 Full Bucket Seat

The Mugen S1 is not simply a generic aftermarket bucket seat with a Mugen logo. It was developed as a dedicated Mugen performance component with an emphasis on low weight, driver support and a rigid composite structure.

Mugen documented the S1 shell as a composite construction using fiberglass and vinyl-ester resin. The design was engineered to provide strength while keeping weight low, with the published seat weight around 5.8 kg without the mounting rails.

For collectors and Honda/Mugen enthusiasts, the S1 is particularly attractive because it represents an older generation of Mugen’s full-bucket-seat program rather than the later MS-R/MS-Z products.

Lightweight Composite Construction

One of the defining characteristics of the Mugen S1 is its lightweight shell.

At approximately 5.8 kg excluding seat rails, the S1 was designed to provide substantial weight savings compared with conventional factory vehicle seats. Mugen’s historical documentation specifically highlights the fiberglass/vinyl-ester composite construction used for the shell.

This makes the S1 particularly appealing for:

• Lightweight performance builds
• Track cars
• Honda performance projects
• Japanese domestic-market builds
• Mugen restorations
• Collector vehicles
• Motorsport-inspired interiors

Full Bucket Seat Design

Unlike reclining sport seats, the Mugen S1 uses a full bucket-seat configuration designed to hold the driver securely during spirited driving and cornering.

The close-fitting bucket design helps maintain a consistent driving position and gives the interior a distinctly motorsport-oriented appearance.

Its low seating concept also contributes to a more performance-focused driving position. Historical Mugen material describes the S1 as having a significantly lower hip point than a conventional seat.

Rare & Collectible Mugen Interior Component

The Mugen S1 81100-XG8-K1S0 is an increasingly uncommon component compared with modern aftermarket bucket seats.

Historical Mugen price lists identify the S1 as an official Mugen product, while current Mugen documentation focuses on later products such as the MS-R and MS-Z.

For enthusiasts building a period-correct Mugen Honda, an original S1 can therefore be considerably more interesting than a modern generic replacement.

Used Condition

This listing is for a used Mugen S1 bucket seat.

As a used performance component, the seat should be inspected carefully before installation. Depending on its previous use, cosmetic wear can include marks to the upholstery, surface wear, fading, scratches or other signs of age.

Buyers should review the available photographs and confirm the exact condition, upholstery, shell condition and included hardware before purchasing.

Fitment & Installation

The Mugen S1 was produced as a performance bucket seat rather than a universal factory replacement seat.

Proper installation requires compatible mounting hardware and/or seat rails. Mugen documentation lists dedicated S1 mounting components separately from the seat itself.

Important: Vehicle compatibility depends on the vehicle, seat position, mounting points, rails and applicable safety requirements. Always verify the correct mounting solution for your specific vehicle before installation.

Do not assume that a particular Mugen rail or bracket fits every Honda or Japanese performance vehicle.

Ideal For

The used Mugen S1 bucket seat is ideal for:

• Honda performance builds
• Mugen restoration projects
• JDM vehicles
• Japanese classic performance cars
• Track-day cars
• Lightweight builds
• Motorsport-inspired interiors
• Collector cars
• Period-correct Mugen projects
• Enthusiasts searching for rare Mugen parts in Europe

Why Buy a Used Mugen S1 Bucket Seat?

Genuine Mugen Heritage

The S1 is an original Mugen performance component rather than a generic aftermarket reproduction.

Lightweight Design

The approximately 5.8 kg seat weight, excluding mounting rails, makes the S1 attractive for weight-conscious builds.

Rare Availability

Original S1 seats are difficult to find compared with more common modern bucket seats.

Motorsport-Inspired Driving Position

The full bucket design and low seating concept are suited to enthusiasts seeking a more focused driving environment.

Excellent Collector Appeal

An authentic Mugen S1 can complement a period-correct Honda or JDM performance build.

Used Mugen S1 vs Modern Mugen Seats

The Mugen S1 should not be confused with the later Mugen MS-R full bucket seat. Mugen’s later MS-R uses a different product number, 81100-XXF-K1S0, and Mugen states that the MS-R meets FIA 8855-1999.

The product offered here is specifically:

Mugen S1 Full Bucket Seat – 81100-XG8-K1S0

Buyers should verify the product label and part number when purchasing a rare used Mugen seat.

Frequently Asked Questions

Is this a genuine Mugen S1 bucket seat?

The listed part number 81100-XG8-K1S0 corresponds to the Mugen S1 Full Bucket Seat in Mugen’s historical documentation.

What is the Mugen S1 part number?

The Mugen S1 Full Bucket Seat is listed under 81100-XG8-K1S0.

Is the Mugen S1 seat new or used?

This listing is specifically for a used Mugen S1 bucket seat.

How much does a Mugen S1 seat weigh?

Mugen’s historical documentation lists the S1 at approximately 5.8 kg excluding the seat rails.

What is the Mugen S1 shell made from?

The original Mugen documentation describes the shell as a fiberglass and vinyl-ester resin composite.

Does the seat include mounting rails?

Do not assume rails are included unless specifically stated in the individual listing. Mugen historically listed the seat and its mounting components separately.

Will the Mugen S1 fit my Honda?

Compatibility depends on the vehicle, mounting points and appropriate seat rails or brackets. Confirm the correct mounting hardware for your specific chassis before ordering.

Is the Mugen S1 a reclining seat?

No. The S1 is a full bucket seat, designed around a fixed performance-oriented bucket configuration.

Is the Mugen S1 FIA approved?

The S1 should not automatically be described as FIA-approved based on its Mugen branding alone. Mugen specifically identifies the later MS-R as meeting FIA 8855-1999.

For competition use, verify the actual homologation label on the seat and the current regulations of the governing organization or event.

Is the Mugen S1 good for a track car?

Its lightweight composite construction and full-bucket design make it attractive for performance and track-oriented builds. However, track use requires appropriate mounting, harness arrangements and compliance with the rules applicable to the specific event.

Is the Mugen S1 still available new?

The S1 is an older Mugen product and is now generally encountered through used or collector markets rather than as a current mainstream Mugen seat. Historical Mugen catalogs list the S1, while current Mugen documentation focuses on newer seat designs.

Why are original Mugen S1 seats valuable to JDM enthusiasts?

The combination of genuine Mugen provenance, lightweight composite construction, distinctive full-bucket design and limited availability makes the S1 particularly interesting for authentic Japanese performance and Mugen builds.