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 not built for comfort. They were stripped, tuned, and sent down 37 miles of public roads with stone walls at arm's length and no margin for mechanical compromise. Speed was the point. Character was the result.
That is what we named this exhaust after.
The Thruxton 900 is one of the most honest café racers in Triumph's modern lineup. But the stock exhaust was engineered for noise compliance, not for what a café racer is supposed to sound like. It mutes the deep, raw tone the 900cc twin is capable of producing. Not a design flaw. A design choice. The Builder Series TT makes a different one.
The Two-Stage Core uses two baffles at two different diameters to control exhaust flow in sequence, maintaining the mid-range torque the Thruxton depends on through corners, city traffic, and rolling throttle. The Dimpled Baffle shapes a deep, classic British twin exhaust note the stock mufflers were never designed to produce. At 2.4 pounds per silencer, it also drops significant weight from a bike that was built to be light in the first place.
This is the exhaust the Thruxton 900 should have shipped with.
Key Features & Benefits
Dimpled Baffle — Shapes a deep, classic British twin exhaust note. Eliminates the thin, hollow sound that perforated cores produce. The Builder Series TT is a loud exhaust by design and is not compatible with dB Killers. For a quieter option that is still mid-range tuned, the Predator Pro 2.0 uses a Louvre Core and is dB Killer compatible.
Two-Stage Core — Controls exhaust flow in two stages to maintain low-to-mid-range torque. Prevents the mid-range power loss common in perforated core aftermarket exhausts. The Thruxton 900 stays responsive through corners and rolling throttle. The Two-Stage Core is exclusive to the Builder Series TT and is the reason dB Killers are not compatible with this design.
Significant Weight Savings — Each silencer weighs 2.4 pounds, replacing stock mufflers at 8 to 10 pounds per side. A bike built to be light gets lighter. Physics, not marketing.
20-Gauge 304 Stainless Steel — Corrosion-resistant and built for heat cycling. Brushed finish pairs naturally with the Thruxton's lines, develops character over time, and requires no polishing.
Exposed Weld, Vintage Custom Aesthetic — Welds left visible and unfinished for a raw, purposeful look. Matches the café racer identity of the Thruxton 900. Distinct from catalog-custom parts that try to hide their construction.
Bolt-On to Stock Headers — Mounts directly to OEM headers and factory mounting points. No cutting, welding, or permanent modification. Requires a tune update to the 2-2 Arrow Map at your local Triumph dealer. Fully reversible.
What's Included
Pair of Builder Series TT Mufflers
Stainless Steel Exhaust Clamp
Mounting Spacer
Technical Specifications
Material: 20-gauge 304 stainless steel
Finish: Brushed stainless
Design: Exposed weld construction with Two-Stage Core and Dimpled Baffle
Weight: 2.4 lbs per silencer (4.8 lbs per pair)
Length: 14 inches
Diameter: 3.75 inches
Hardware: Stainless steel exhaust clamp and mounting spacer included
Fitment: Triumph Thruxton 900 (2004–2016)
Fitment Note: Requires a tune update to the 2-2 Arrow Map at your local Triumph dealer.
Installation Guide
Estimated Install Time: 30 minutes plus dealer visit for tune update
Skill Level: Beginner. Straightforward bolt-on swap using factory mounting points. Tune update requires a visit to your local Triumph dealer.
Tools Required: Socket set, Allen key set, torque wrench
Installation Steps:
Remove the stock mufflers from the OEM headers by loosening the exhaust clamps and mounting hardware.
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 tighten all hardware to the manufacturer-recommended torque specification.
Visit your local Triumph dealer to have the ECU updated to the 2-2 Arrow Map.
Installation Guide
Estimated Install Time: 30 minutes plus dealer visit for tune update
Skill Level: Beginner. Straightforward bolt-on swap using factory mounting points. Tune update requires a visit to your local Triumph dealer.
Tools Required: Socket set, Allen key set, torque wrench
Installation Steps:
Remove the stock mufflers from the OEM headers by loosening the exhaust clamps and mounting hardware.
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 tighten all hardware to the manufacturer-recommended torque specification.
Visit your local Triumph dealer to have the ECU updated to the 2-2 Arrow Map.
HOW TO INSTALL BUILDER SERIES SHORTY EXHAUST
SOUND DEMO FOR BUILDER SERIES SHORTY FOR TRIUMPH SPEED TWIN 1200 & RS (2025+)
Installation Notes: The Builder Series TT mounts to factory headers and uses stock mounting points. No modification to the frame, headers, or catalytic converter is required. The install is fully reversible. The Thruxton 900 requires a tune update to the 2-2 Arrow Map, available at any authorized Triumph dealer.
Warranty
Duration: 1 year limited warranty
Coverage: Defects in materials and workmanship under normal use
Exclusions: Damage from improper installation, modification, or misuse
Frequently Asked Questions
Q: Will the Builder Series TT fit my Thruxton 900 without modification?
A: Yes. The Builder Series TT is fitment verified for the Triumph Thruxton 900 (2004–2016). It bolts directly onto the stock headers and uses factory mounting points. No cutting, welding, or modification is required.
Q: Do I need an ECU remap after installing this exhaust?
A: Yes. The Thruxton 900 requires a tune update to the 2-2 Arrow Map, which is available at any authorized Triumph dealer. This ensures the fuel mapping is optimized for the Builder Series TT's exhaust flow characteristics.
Q: How does the sound compare to stock?
A: The Dimpled Baffle delivers a deep, classic British twin exhaust note that brings out the engine's natural character. It is noticeably more present than stock but not excessive. It eliminates the flat, muted tone of the factory mufflers without being obnoxiously loud.
Q: What is the weight savings over stock?
A: The Builder Series TT weighs 2.4 pounds per silencer (4.8 pounds per pair). Stock Thruxton 900 mufflers typically weigh 8 to 10 pounds per side. That is approximately 11 to 15 pounds of weight removed from the rear of the bike.
Fitment
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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 not built for comfort. They were stripped, tuned, and sent down 37 miles of public roads with stone walls at arm's length and no margin for mechanical compromise. Speed was the point. Character was the result.
That is what we named this exhaust after.
The Thruxton 900 is one of the most honest café racers in Triumph's modern lineup. But the stock exhaust was engineered for noise compliance, not for what a café racer is supposed to sound like. It mutes the deep, raw tone the 900cc twin is capable of producing. Not a design flaw. A design choice. The Builder Series TT makes a different one.
The Two-Stage Core uses two baffles at two different diameters to control exhaust flow in sequence, maintaining the mid-range torque the Thruxton depends on through corners, city traffic, and rolling throttle. The Dimpled Baffle shapes a deep, classic British twin exhaust note the stock mufflers were never designed to produce. At 2.4 pounds per silencer, it also drops significant weight from a bike that was built to be light in the first place.
This is the exhaust the Thruxton 900 should have shipped with.
Key Features & Benefits
Dimpled Baffle — Shapes a deep, classic British twin exhaust note. Eliminates the thin, hollow sound that perforated cores produce. The Builder Series TT is a loud exhaust by design and is not compatible with dB Killers. For a quieter option that is still mid-range tuned, the Predator Pro 2.0 uses a Louvre Core and is dB Killer compatible.
Two-Stage Core — Controls exhaust flow in two stages to maintain low-to-mid-range torque. Prevents the mid-range power loss common in perforated core aftermarket exhausts. The Thruxton 900 stays responsive through corners and rolling throttle. The Two-Stage Core is exclusive to the Builder Series TT and is the reason dB Killers are not compatible with this design.
Significant Weight Savings — Each silencer weighs 2.4 pounds, replacing stock mufflers at 8 to 10 pounds per side. A bike built to be light gets lighter. Physics, not marketing.
20-Gauge 304 Stainless Steel — Corrosion-resistant and built for heat cycling. Brushed finish pairs naturally with the Thruxton's lines, develops character over time, and requires no polishing.
Exposed Weld, Vintage Custom Aesthetic — Welds left visible and unfinished for a raw, purposeful look. Matches the café racer identity of the Thruxton 900. Distinct from catalog-custom parts that try to hide their construction.
Bolt-On to Stock Headers — Mounts directly to OEM headers and factory mounting points. No cutting, welding, or permanent modification. Requires a tune update to the 2-2 Arrow Map at your local Triumph dealer. Fully reversible.
What's Included
Pair of Builder Series TT Mufflers
Stainless Steel Exhaust Clamp
Mounting Spacer
Technical Specifications
Material: 20-gauge 304 stainless steel
Finish: Brushed stainless
Design: Exposed weld construction with Two-Stage Core and Dimpled Baffle
Weight: 2.4 lbs per silencer (4.8 lbs per pair)
Length: 14 inches
Diameter: 3.75 inches
Hardware: Stainless steel exhaust clamp and mounting spacer included
Fitment: Triumph Thruxton 900 (2004–2016)
Fitment Note: Requires a tune update to the 2-2 Arrow Map at your local Triumph dealer.
Installation Guide
Estimated Install Time: 30 minutes plus dealer visit for tune update
Skill Level: Beginner. Straightforward bolt-on swap using factory mounting points. Tune update requires a visit to your local Triumph dealer.
Tools Required: Socket set, Allen key set, torque wrench
Installation Steps:
Remove the stock mufflers from the OEM headers by loosening the exhaust clamps and mounting hardware.
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 tighten all hardware to the manufacturer-recommended torque specification.
Visit your local Triumph dealer to have the ECU updated to the 2-2 Arrow Map.
Installation Guide
Estimated Install Time: 30 minutes plus dealer visit for tune update
Skill Level: Beginner. Straightforward bolt-on swap using factory mounting points. Tune update requires a visit to your local Triumph dealer.
Tools Required: Socket set, Allen key set, torque wrench
Installation Steps:
Remove the stock mufflers from the OEM headers by loosening the exhaust clamps and mounting hardware.
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 tighten all hardware to the manufacturer-recommended torque specification.
Visit your local Triumph dealer to have the ECU updated to the 2-2 Arrow Map.
HOW TO INSTALL BUILDER SERIES SHORTY EXHAUST
SOUND DEMO FOR BUILDER SERIES SHORTY FOR TRIUMPH SPEED TWIN 1200 & RS (2025+)
Installation Notes: The Builder Series TT mounts to factory headers and uses stock mounting points. No modification to the frame, headers, or catalytic converter is required. The install is fully reversible. The Thruxton 900 requires a tune update to the 2-2 Arrow Map, available at any authorized Triumph dealer.
Warranty
Duration: 1 year limited warranty
Coverage: Defects in materials and workmanship under normal use
Exclusions: Damage from improper installation, modification, or misuse
Frequently Asked Questions
Q: Will the Builder Series TT fit my Thruxton 900 without modification?
A: Yes. The Builder Series TT is fitment verified for the Triumph Thruxton 900 (2004–2016). It bolts directly onto the stock headers and uses factory mounting points. No cutting, welding, or modification is required.
Q: Do I need an ECU remap after installing this exhaust?
A: Yes. The Thruxton 900 requires a tune update to the 2-2 Arrow Map, which is available at any authorized Triumph dealer. This ensures the fuel mapping is optimized for the Builder Series TT's exhaust flow characteristics.
Q: How does the sound compare to stock?
A: The Dimpled Baffle delivers a deep, classic British twin exhaust note that brings out the engine's natural character. It is noticeably more present than stock but not excessive. It eliminates the flat, muted tone of the factory mufflers without being obnoxiously loud.
Q: What is the weight savings over stock?
A: The Builder Series TT weighs 2.4 pounds per silencer (4.8 pounds per pair). Stock Thruxton 900 mufflers typically weigh 8 to 10 pounds per side. That is approximately 11 to 15 pounds of weight removed from the rear of the bike.
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?
On most fitments, no ECU tuning is required when the factory catalytic converter is in place. The Thruxton 900 is the exception — it requires a tune update to the 2-2 Arrow Map at an authorized Triumph dealer. Select your fitment above for model-specific details.
How loud is this exhaust compared to stock?
The Builder Series TT is a loud exhaust by design. The Dimpled Baffle shapes a deep, performance exhaust note that is significantly more present than stock. It is not compatible with dB Killers. For a quieter option that is still mid-range tuned and dB Killer compatible, the Predator Pro 2.0 uses a Louvre Core.
Will I lose mid-range power with this exhaust?
No. The Two-Stage Core is specifically designed to maintain backpressure in the low-to-mid-range. Unlike perforated core designs that sacrifice torque for top-end noise, the TT keeps the engine responsive where riders actually use it.
What is the weight savings over stock?
The Builder Series TT weighs 2.4 pounds per silencer (4.8 pounds per pair). Stock mufflers typically weigh 8 to 10 pounds per side. That is approximately 11 to 15 pounds removed from the rear of the bike.
What is the difference between the Builder Series TT and the Predator Pro 2.0?
Different core designs, different sounds. The TT uses a Two-Stage Core with Dimpled Baffle — a performance exhaust note, loud by design, not compatible with dB Killers. The Predator Pro 2.0 uses a Louvre Core built from 18-gauge stainless steel, which produces a deeper, more classic sound. The heavier gauge allows all welds to be fully finished, giving the Predator Pro its cleaner appearance. The Predator Pro 2.0 is dB Killer compatible. Choose the TT for a performance note at full volume. Choose the Predator Pro 2.0 for a deeper, classic sound with the option to dial it back.
Is the brushed stainless finish the only option?
Yes. The Builder Series TT is available in brushed stainless steel. This finish is low maintenance, develops character over time, and pairs with any build direction.
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