Triumph Street Cup & Street Twin 900 Slip-On Exhaust
Since 1907, the Isle of Man TT has run through stone villages, across a mountain pass, and along hedgerow-lined roads on a small island in the Irish Sea. The same roads every year. What changes are the bikes. The ones that make it to the start line are not the most expensive ones. They are the ones where every component was chosen with the finish line in mind.
That is what we named this exhaust after.
The Street Cup and Street Twin are where a lot of riders start building their first custom motorcycle. The platform is capable. The stock exhaust is not the limiting factor for riding, but it does not match the intention of a bike that is being built into something personal. It is heavy, restrained, and visually generic. So is the exhaust on every other bike in the parking lot. The Builder Series TT changes that without making the project complicated.
The Two-Stage Core controls exhaust flow in two stages, keeping mid-range torque intact for the riding where the Street Cup and Street Twin spend most of their time: city traffic, stop-and-go commutes, and back-road weekends. The Dimpled Baffle shapes a deep exhaust note that matches the character these bikes deserve. At 2.4 pounds per silencer, it removes 6 to 8 pounds per side from the rear of the bike, which changes how both models feel through direction changes immediately.
This is the exhaust that belongs on a rider's first build.
Key Features & Benefits
Dimpled Baffle Sound Character — Shapes a deep, performance exhaust note that brings out the engine's natural voice. 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 — Two-stage exhaust flow control keeps the engine responsive in the low-to-mid-range power band. No mid-range torque loss. The bike pulls clean from stops and rolls smoothly through traffic, which is where Street Cup and Street Twin riders spend most of their time. 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 Reduction — Each silencer weighs 2.4 pounds, replacing stock mufflers at 8 to 10 pounds per side. The Street Cup and Street Twin feel noticeably lighter and quicker to change direction through city streets and tight corners. Physics, not marketing.
20-Gauge 304 Stainless Steel — Corrosion-resistant, handles heat cycling, and maintains its appearance without polishing. Clean and low maintenance for a daily rider.
Raw, Exposed-Weld Construction — Unfinished welds give the TT a vintage custom aesthetic that fits naturally on a rider's first build project. The look is intentional and purposeful, not polished or catalog-perfect.
Straightforward Install on Stock Hardware — Uses existing mounting points and factory headers. No modifications, no ECU tuning with the factory catalytic converter in place. A simple afternoon swap.
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 Street Cup (2016–2019), Triumph Street Twin (2016–2022)
Installation Guide
Estimated Install Time: 30 minutes
Skill Level: Beginner. A straightforward factory-replacement install using existing mounting points.
Tools Required: Socket set, Allen key set, torque wrench
Installation Steps:
Loosen the stock exhaust clamps and remove the factory mufflers from the header pipes.
Position the Builder Series TT silencers onto the stock headers.
Attach each silencer with the included stainless steel exhaust clamp and tighten to a snug fit.
Install the mounting spacer and bring all fasteners to the manufacturer-recommended torque specification.
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 uses the same mounting interface as the stock exhaust. No frame or header modification is needed. The install is fully reversible. No ECU tuning is required when used with the factory catalytic converter.
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: Does this fit both the Street Cup and the Street Twin?
A: Yes. The Builder Series TT is fitment verified for the Triumph Street Cup (2016–2019) and the Street Twin (2016–2022). Both models use the same exhaust mounting interface.
Q: Will shorter mufflers affect chain access for maintenance?
A: Yes. The Builder Series TT silencers are 14 inches long, shorter than the stock mufflers. This opens up space around the swingarm and rear wheel, making routine chain adjustment and cleaning easier.
Q: Is this exhaust too loud for daily commuting?
A: No. The Dimpled Baffle produces a deep, classic tone that is present without being excessive. It is designed for riders who use their bike every day, including early morning starts and residential neighborhoods.
Q: Can I install this myself with basic tools?
A: Yes. The Builder Series TT is a bolt-on exhaust that uses factory mounting points. It requires basic hand tools and takes approximately 30 minutes. No special skills, cutting, or welding are needed.
Fitment
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Triumph Street Cup & Street Twin 900 Slip-On Exhaust
Since 1907, the Isle of Man TT has run through stone villages, across a mountain pass, and along hedgerow-lined roads on a small island in the Irish Sea. The same roads every year. What changes are the bikes. The ones that make it to the start line are not the most expensive ones. They are the ones where every component was chosen with the finish line in mind.
That is what we named this exhaust after.
The Street Cup and Street Twin are where a lot of riders start building their first custom motorcycle. The platform is capable. The stock exhaust is not the limiting factor for riding, but it does not match the intention of a bike that is being built into something personal. It is heavy, restrained, and visually generic. So is the exhaust on every other bike in the parking lot. The Builder Series TT changes that without making the project complicated.
The Two-Stage Core controls exhaust flow in two stages, keeping mid-range torque intact for the riding where the Street Cup and Street Twin spend most of their time: city traffic, stop-and-go commutes, and back-road weekends. The Dimpled Baffle shapes a deep exhaust note that matches the character these bikes deserve. At 2.4 pounds per silencer, it removes 6 to 8 pounds per side from the rear of the bike, which changes how both models feel through direction changes immediately.
This is the exhaust that belongs on a rider's first build.
Key Features & Benefits
Dimpled Baffle Sound Character — Shapes a deep, performance exhaust note that brings out the engine's natural voice. 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 — Two-stage exhaust flow control keeps the engine responsive in the low-to-mid-range power band. No mid-range torque loss. The bike pulls clean from stops and rolls smoothly through traffic, which is where Street Cup and Street Twin riders spend most of their time. 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 Reduction — Each silencer weighs 2.4 pounds, replacing stock mufflers at 8 to 10 pounds per side. The Street Cup and Street Twin feel noticeably lighter and quicker to change direction through city streets and tight corners. Physics, not marketing.
20-Gauge 304 Stainless Steel — Corrosion-resistant, handles heat cycling, and maintains its appearance without polishing. Clean and low maintenance for a daily rider.
Raw, Exposed-Weld Construction — Unfinished welds give the TT a vintage custom aesthetic that fits naturally on a rider's first build project. The look is intentional and purposeful, not polished or catalog-perfect.
Straightforward Install on Stock Hardware — Uses existing mounting points and factory headers. No modifications, no ECU tuning with the factory catalytic converter in place. A simple afternoon swap.
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 Street Cup (2016–2019), Triumph Street Twin (2016–2022)
Installation Guide
Estimated Install Time: 30 minutes
Skill Level: Beginner. A straightforward factory-replacement install using existing mounting points.
Tools Required: Socket set, Allen key set, torque wrench
Installation Steps:
Loosen the stock exhaust clamps and remove the factory mufflers from the header pipes.
Position the Builder Series TT silencers onto the stock headers.
Attach each silencer with the included stainless steel exhaust clamp and tighten to a snug fit.
Install the mounting spacer and bring all fasteners to the manufacturer-recommended torque specification.
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 uses the same mounting interface as the stock exhaust. No frame or header modification is needed. The install is fully reversible. No ECU tuning is required when used with the factory catalytic converter.
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: Does this fit both the Street Cup and the Street Twin?
A: Yes. The Builder Series TT is fitment verified for the Triumph Street Cup (2016–2019) and the Street Twin (2016–2022). Both models use the same exhaust mounting interface.
Q: Will shorter mufflers affect chain access for maintenance?
A: Yes. The Builder Series TT silencers are 14 inches long, shorter than the stock mufflers. This opens up space around the swingarm and rear wheel, making routine chain adjustment and cleaning easier.
Q: Is this exhaust too loud for daily commuting?
A: No. The Dimpled Baffle produces a deep, classic tone that is present without being excessive. It is designed for riders who use their bike every day, including early morning starts and residential neighborhoods.
Q: Can I install this myself with basic tools?
A: Yes. The Builder Series TT is a bolt-on exhaust that uses factory mounting points. It requires basic hand tools and takes approximately 30 minutes. No special skills, cutting, or welding are needed.
Fitment
Other Slip-On Exhaust for Triumph Street Twin & Street Cup
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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