Triumph's history at the Isle of Man TT runs deeper than most marques. Before the Bonneville carried that name, Triumph engines were already winning on 37 miles of closed public roads in the Irish Sea. The bikes that ran there became the foundation for everything the Bonneville stands for: characterful, light, and built with a reason behind every decision.
That is what we named this exhaust after.
The Bonneville T100 and T120 carry that lineage. The stock exhaust does not. Factory mufflers on the modern Bonneville are engineered for compliance, not character. They are quiet by design and heavy for what they are. The natural voice of the parallel twin, the exhaust note that defined the original Bonneville, is muted at the factory. The Builder Series TT is the correction.
The Two-Stage Core uses two baffles at two different diameters to control exhaust flow in sequence, preserving the low-to-mid-range torque the Bonneville is built around. The Dimpled Baffle shapes a deep, classic exhaust note that brings out the natural voice of the twin. At 2.4 pounds per silencer, replacing stock mufflers at 8 to 10 pounds per side makes the Bonneville feel like the bike it was always supposed to be.
The name is not borrowed. The Bonneville earned it decades ago. This exhaust brings that history forward.
Key Features & Benefits
Dimpled Baffle — Delivers a deep, classic exhaust note that brings out the twin-cylinder voice of the Bonneville platform. 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 — Maintains low-to-mid-range torque by controlling exhaust flow in two stages. The Bonneville's relaxed riding character depends on smooth, responsive power delivery. 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. The Bonneville feels more connected through turns and at low speed. Physics, not marketing.
20-Gauge 304 Stainless Steel — Corrosion-resistant and rated for sustained heat cycling. Brushed finish requires no polishing and develops character over time.
Exposed Weld Aesthetic — Visible, unfinished welds give the TT a raw, vintage look that complements the Bonneville's classic lines. It looks like the rider built it, not like it came out of a box. A purposeful departure from highly polished aftermarket options.
Factory-Replacement Fitment — Mounts to OEM headers and stock mounting points. No cutting, no welding, no permanent modification. No ECU tuning required with the factory catalytic converter. A clean, simple install.
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
Skill Level: Beginner. A bolt-on swap that uses the factory exhaust mounting points.
Tools Required: Socket set, Allen key set, torque wrench
HOW TO INSTALL BUILDER SERIES SHORTY EXHAUST
SOUND DEMO FOR BUILDER SERIES SHORTY FOR TRIUMPH SPEED TWIN 1200 & RS (2025+)
Installation Notes: Fitment is identical for both the T100 and T120. The Builder Series TT uses the stock header outlet and OEM mounting points. No modification to the frame, headers, or catalytic converter is required. The install is fully reversible.
Warranty
Duration: 1 year limited warranty
Coverage: Defects in materials and workmanship under normal use
Exclusions: Damage from improper installation, modification, or misuse
Fitment
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Triumph's history at the Isle of Man TT runs deeper than most marques. Before the Bonneville carried that name, Triumph engines were already winning on 37 miles of closed public roads in the Irish Sea. The bikes that ran there became the foundation for everything the Bonneville stands for: characterful, light, and built with a reason behind every decision.
That is what we named this exhaust after.
The Bonneville T100 and T120 carry that lineage. The stock exhaust does not. Factory mufflers on the modern Bonneville are engineered for compliance, not character. They are quiet by design and heavy for what they are. The natural voice of the parallel twin, the exhaust note that defined the original Bonneville, is muted at the factory. The Builder Series TT is the correction.
The Two-Stage Core uses two baffles at two different diameters to control exhaust flow in sequence, preserving the low-to-mid-range torque the Bonneville is built around. The Dimpled Baffle shapes a deep, classic exhaust note that brings out the natural voice of the twin. At 2.4 pounds per silencer, replacing stock mufflers at 8 to 10 pounds per side makes the Bonneville feel like the bike it was always supposed to be.
The name is not borrowed. The Bonneville earned it decades ago. This exhaust brings that history forward.
Key Features & Benefits
Dimpled Baffle — Delivers a deep, classic exhaust note that brings out the twin-cylinder voice of the Bonneville platform. 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 — Maintains low-to-mid-range torque by controlling exhaust flow in two stages. The Bonneville's relaxed riding character depends on smooth, responsive power delivery. 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. The Bonneville feels more connected through turns and at low speed. Physics, not marketing.
20-Gauge 304 Stainless Steel — Corrosion-resistant and rated for sustained heat cycling. Brushed finish requires no polishing and develops character over time.
Exposed Weld Aesthetic — Visible, unfinished welds give the TT a raw, vintage look that complements the Bonneville's classic lines. It looks like the rider built it, not like it came out of a box. A purposeful departure from highly polished aftermarket options.
Factory-Replacement Fitment — Mounts to OEM headers and stock mounting points. No cutting, no welding, no permanent modification. No ECU tuning required with the factory catalytic converter. A clean, simple install.
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
Skill Level: Beginner. A bolt-on swap that uses the factory exhaust mounting points.
Tools Required: Socket set, Allen key set, torque wrench
HOW TO INSTALL BUILDER SERIES SHORTY EXHAUST
SOUND DEMO FOR BUILDER SERIES SHORTY FOR TRIUMPH SPEED TWIN 1200 & RS (2025+)
Installation Notes: Fitment is identical for both the T100 and T120. The Builder Series TT uses the stock header outlet and OEM mounting points. No modification to the frame, headers, or catalytic converter is required. The install is fully reversible.
Warranty
Duration: 1 year limited warranty
Coverage: Defects in materials and workmanship under normal use
Exclusions: Damage from improper installation, modification, or misuse
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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