Pair of Builder Series TT silencers side by side showing the full taper and slip on inlet tubes

Single Builder Series TT silencer, three quarter view, brushed 304 stainless with mounting bracket

Close up of the Builder Series TT mounting bracket and exposed weld beads on brushed stainless

British Customs

BC902.2.110-BS-BR

Builder Series TT Slip-On Exhaust for Triumph Thruxton 1200 R, RS & Speed Twin 1200

Name: Builder Series TT Slip-On Exhaust for Triumph Thruxton 1200 R, RS & Speed Twin 1200
Brand: British Customs
SKU: BC902.2.110-BS-BR
Price: 599.95 USD
Availability: InStock
Rating: 5 (183 reviews)

$599.95

Tax excluded. Shipping calculated at checkout

The Builder Series TT is a bolt on slip on exhaust for the Triumph Thruxton 1200 R, Thruxton 1200 RS, and Speed Twin 1200, built in 20 gauge 304 stainless with a Two Stage Core that holds mid range torque and a Dimpled Baffle that shapes a deep note from the 1200cc twin. One exhaust, three fitments, no tune needed.

This is a loud exhaust by design and it does not accept a dB Killer. If you want a quieter setup, we recommend the Predator Pro, which takes an optional dB Killer.

Fits

Triumph Thruxton 1200 R & RS, Speed Twin 1200

Material

20 gauge 304 stainless steel · brushed finish · exposed weld

Origin

Made in the USA

Install

Bolt on · about 30 minutes · socket set, Allen keys, torque wrench · no ECU tune with the factory catalytic converter

Only 3 left in stock

Check Fitment for Your Bike

Free shipping

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Need Help

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Call: +1 (877) 999 BRIT
Email: support@british-customs.com

One Exhaust, Three of Triumph's Most Capable Modern Classics

Since 1907 the Isle of Man TT has run on closed public roads in the Irish Sea. Thirty seven miles. Stone walls, a mountain section, and no runoff. What came out of that race was a precise understanding of what performance actually requires: light weight, responsive power through every RPM range, and a sound that tells you the engine is working.

The Thruxton 1200 R, the Thruxton 1200 RS, and the Speed Twin 1200 are among the most capable machines in Triumph's modern classic lineup. The stock exhaust does not reflect that. Factory mufflers are heavy and quiet, and they hold back the 1200cc twin in exactly the RPM range where these bikes are most alive. The factory had its reasons. You have yours.

The Two Stage Core runs two baffles at two different diameters to control flow in sequence, holding backpressure through the low and mid range where these bikes live. The Dimpled Baffle brings out the natural voice of the engine. At 2.4 pounds per silencer against 8 to 10 pounds of stock muffler per side, all three bikes sharpen through corners immediately.

The TT is loud. That is the design, not a side effect, and it does not accept a dB Killer. If quiet matters more to you than volume, look at the Predator Pro instead, which takes an optional dB Killer.

Key Features & Benefits

Dimpled Baffle: produces a deep note that brings out the natural voice of the 1200cc twin. The TT is loud by design and is not compatible with dB Killers. For a quieter setup, we recommend the Predator Pro, which takes an optional dB Killer.
Two Stage Core: two stage flow control preserves the low and mid range torque that defines the 1200cc platform, keeping the engine pulling through rolling throttle and corner exits where perforated core designs fall flat. Exclusive to the Builder Series TT.
Real weight off the back: 2.4 pounds per silencer against 8 to 10 pounds per side for stock. All three bikes sharpen through corners and direction changes. Physics, not marketing.
20 gauge 304 stainless steel: corrosion resistant and rated for sustained heat cycling. The brushed finish needs no polishing and gains character over time.
Garage built look: exposed welds and a brushed finish. This is not a catalog part. It looks like the rider built it.
Direct swap on stock hardware: fits the stock headers and factory mounting points on all three models. No cutting, welding, or frame modification. Install it in an afternoon and ride.

Specs & Warranty

Material: 20 gauge 304 stainless steel, brushed, exposed weld
Design: Two Stage Core with Dimpled Baffle
Weight: 2.4 pounds per silencer, 4.8 pounds per pair. Stock is 8 to 10 pounds per side
Length: 14 inches
Diameter: 3.75 inches
Origin: made in the USA
Fitment: Triumph Thruxton 1200 R 2016 to 2019, Thruxton 1200 RS 2020 to 2024, Speed Twin 1200 2019 to 2024
Tuning: no ECU tune required with the factory catalytic converter in place
Warranty: 1 year limited warranty covering defects in materials and workmanship under normal use. Excludes damage from improper installation, modification, or misuse

What's Included

(1) Pair of Builder Series TT mufflers
(1) Stainless steel exhaust clamp
(1) Mounting spacer

Install

Difficulty: Beginner · Time: about 30 minutes · Tools: socket set, Allen key set, torque wrench

Let the exhaust cool, then loosen the exhaust clamps and disconnect the mounting hardware from the frame to remove the stock mufflers.
Slide the Builder Series TT silencers onto the stock header outlet pipes.
Secure each silencer with the included stainless steel exhaust clamp.
Install the mounting spacer and torque all fasteners to the manufacturer specification.
Start the bike and recheck the joints for leaks.

Before You Buy

Check your model and year: fits the Thruxton 1200 R 2016 to 2019, Thruxton 1200 RS 2020 to 2024, and Speed Twin 1200 2019 to 2024. The 2025 and newer Speed Twin 1200 and 1200 RS use a different Builder Series TT part.
Loud by design, and it does not accept a dB Killer. If you want it quieter, we recommend the Predator Pro with the optional dB Killer.
No tune needed with the factory catalytic converter in place. The install is fully reversible.
Brushed finish is meant to age. No polishing, and it gains character with heat cycles.

Frequently Asked Questions

Builder Series Shorty

Does one part really fit all three bikes?

Yes. The Builder Series TT mounts directly to stock headers and factory mounting points. No cutting, welding, or permanent modification is required. Select your fitment above for model-specific installation details.

Do I need a tune or an ECU remap?

No, not with the factory catalytic converter in place. The Two Stage Core controls flow in sequence rather than opening the system wide, so the bike keeps its mid range without a remap.

How loud is it, and can I fit a dB Killer?

It is loud by design. The Dimpled Baffle shapes a deep note from the 1200cc twin, and the TT is not compatible with dB Killers. For a quieter setup, we recommend the Predator Pro, which takes an optional dB Killer.

How much weight does it save?

2.4 pounds per silencer, 4.8 pounds per pair. Stock mufflers run 8 to 10 pounds per side, so real weight comes off the back where you feel it through direction changes.

Is it street legal where I ride?

Sound and emissions rules vary by state and by country, and this exhaust is loud by design with no dB Killer option. Check your local regulations before ordering.

Will it fit my 2025 Speed Twin 1200?

No. The 2025 and newer Speed Twin 1200 and 1200 RS use a different Builder Series TT part. This one covers 2019 to 2024.