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

Triumph Thruxton 900 rear three quarter showing the Builder Series TT silencer and spoked rear wheel

Triumph Thruxton 900 front three quarter with the Builder Series TT exhaust along the right side

Rear view of a Triumph Thruxton 900 showing both Builder Series TT outlets either side of the tyre

British Customs

BC902.1.116-BS-BR

Builder Series TT Slip-On Exhaust for Triumph Thruxton 900 (2004-2016)

Name: Builder Series TT Slip-On Exhaust for Triumph Thruxton 900 (2004-2016)
Brand: British Customs
SKU: BC902.1.116-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 900, 2004 to 2016, built in 20 gauge 304 stainless with a Two Stage Core that holds mid range torque and a Dimpled Baffle that shapes a deep classic British twin note. Fitment verified, 2.4 pounds per silencer, and it needs a dealer tune update to the 2-2 Arrow Map.

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 900

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 · requires a dealer tune to the 2-2 Arrow Map

In Stock

Not legal for sale or use in California

California orders will be canceled learn more

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

The Thruxton 900 Exhaust the Café Racer Should Have Shipped With

Since 1907 the Isle of Man TT has been the defining test of what a café racer can do. The bikes that ran there were stripped, tuned, and sent down 37 miles of public road with stone walls at arm's length. Speed was the point. Character was the result.

The Thruxton 900 is one of the most honest café racers Triumph has made. Its stock exhaust is quiet, and it mutes the deep raw tone the 900cc twin can produce. Not a design flaw. A design choice. The Builder Series TT makes a different one.

The Two Stage Core runs two baffles at two different diameters to control flow in sequence, so mid range torque survives corners, city traffic, and rolling throttle. The Dimpled Baffle shapes a note the stock mufflers were never built to make. At 2.4 pounds per silencer, a bike built to be light gets lighter.

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: shapes a deep classic British twin note and kills the thin hollow sound perforated cores produce. 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: controls flow in two stages to hold low and mid range torque, preventing the mid range loss common in perforated core aftermarket exhausts. Exclusive to the Builder Series TT.
Real weight off a light bike: 2.4 pounds per silencer against 8 to 10 pounds per side for stock. Roughly 11 to 15 pounds off the back. Physics, not marketing.
20 gauge 304 stainless steel: corrosion resistant and built for heat cycling. The brushed finish pairs with the Thruxton's lines and needs no polishing.
Exposed weld, vintage custom look: welds left visible and unfinished. It matches the café racer identity instead of hiding its construction.
Bolt on to stock headers: mounts to OEM headers and factory points. No cutting, no welding, fully reversible.

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 900, 2004 to 2016
Fitment note: requires a tune update to the 2-2 Arrow Map at your local Triumph dealer
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 plus a dealer visit · Tools: socket set, Allen key set, torque wrench

Let the exhaust cool, then loosen the exhaust clamps and mounting hardware and remove the stock mufflers from the OEM headers.
Slide the Builder Series TT silencers onto the stock header pipes.
Secure each silencer with the included stainless steel exhaust clamp.
Install the mounting spacer and torque all hardware to the manufacturer specification.
Visit your local Triumph dealer to have the ECU updated to the 2-2 Arrow Map.

Before You Buy

Check your model: fits the Triumph Thruxton 900, 2004 to 2016. It does not fit the Thruxton 1200 series.
This one needs a dealer tune. The Thruxton 900 requires a tune update to the 2-2 Arrow Map, available at any authorised Triumph dealer. Budget for that visit.
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.
Brushed finish is meant to age. No polishing, and it gains character with heat cycles.

Frequently Asked Questions

Builder Series Shorty

Will the Builder Series TT fit my Thruxton 900 without modification?

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 an ECU remap after installing this exhaust?

Yes. The Thruxton 900 requires a tune update to the 2-2 Arrow Map, available at any authorised Triumph dealer. That optimises the fuel mapping for the exhaust flow.

How does the sound compare to stock?

The Dimpled Baffle gives a deep classic British twin note that brings out the engine's own character. Noticeably more present than stock, and it removes the flat muted tone of the factory mufflers.

How much weight does it save?

2.4 pounds per silencer, 4.8 pounds per pair. Stock Thruxton 900 mufflers run 8 to 10 pounds per side, so roughly 11 to 15 pounds comes off the back of the bike.

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.

Can I install it myself?

Yes. It is a bolt on swap using factory mounting points, about 30 minutes with a socket set, Allen keys, and a torque wrench. The dealer tune is the only step you cannot do at home.

Other Slip-On Exhaust

British Customs

Predator Pro 2.0 Slip On Exhaust

$749.95

British Customs

Shorty Predator Pro 2.0

$749.95

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