The Sleeper Exhaust was originally designed in 2008, the peashooter design pays tribute to the 1960s and 70s factory Triumphs. The goal of the Sleeper was to increase the performance and improve the exhaust note while keeping close to the original Triumph aesthetic; more power with a toned down appearance, hence "Sleeper." In 2017 the Sleeper Exhaust was redesigned and released as the Sleeper Pro. 9 years of design, testing, and customer feedback was used to develop the Sleeper Pro. The look and the sound has not changed, but the internals have been completely redesigned for additional durability and weight savings.
Sleeper Pro Design
The two-piece design of the Sleeper Pro is a streamlined update over the original three-piece sleeper design prior to 2016. The Sleeper Pro body is formed from 18 gauge stainless steel and finished to match the factory headers of your bike. The forming process, rather than a rolled cone, creates a continuous radius throughout the exhaust body. This limits the number of welds, reducing potential weak points, and provides a proper 1960s "peashooter" look.
The Sleeper Pro body encloses the louvre core mechanical baffle system. Each louvre is manufactured from a solid tube and pierced using our proprietary louvering tool. The body and baffle are then welded together at two points, fully integrating the baffle and increasing the structural rigidity of the muffler.
The Sleeper Pro is a direct factory replacement, mounted via a 14 gauge stainless steel bracket. Please note: on T100 and T120 models, you will reuse the factory mounting iron which will need to be removed from the factory muffler and re-installed on your Sleeper Pro prior to mounting on the bike. See installation guides for more info. All Sleeper Pro Slip On Exhaust will come with our vibration dampening bracket components which enable you to rubber mount the Sleeper Pro, similar to the stock unit. This reduces vibration, protecting both the Exhaust and your bike.
Included Components:
- Sleeper Pro Exhausts (pair)
- Vibration dampening bracket components (top hat, spacer, rubber damper
- Stainless Steel mounting hardware
- Exhaust Gaskets (Bonneville T100/T120 versions only)
Metal Finish Options
British Customs attempts to match the factory header finish on each model. As part of the effort, we try to offer Black-coated pipes for all of the factory "BLACK" models that Triumph offers. To see these options, select one of the "BLACK" models from the dropdown above.
Known "Black" models:
Triumph offers the Bonneville T100, Bonneville T120, and Bonneville Bobber in "BLACK" versions with black engine cases and black exhaust headers. In all years we have tested, the Black version of the bike utilizes the same headers and therefore, mufflers, as the standard version, albeit in different finishes but always polished, brushed, or black.
Example: The Sleeper Pro for Bonneville Bobber (brushed) WILL ALSO FIT the Bonneville Bobber Black, however they WILL NOT match the headers. In the reverse, the Sleeper Pro for Bonneville Bobber Black (black coated) WILL ALSO FIT the Bonneville Bobber. This applies to Bonnevlle T100/Black, Bonneville T120/Black, Bonneville Bobber/Black.
Please do not hesitate to contact us if you have any questions. We also offer an add-on coating service by special order for pipes not currently offered in black (2-6 week turnaround).
Installation Process
The Sleeper Pro Slip On Exhaust installs in under an hour with common tools. Simply remove the factory exhaust and bolt on the Sleeper Pro. Remapping is not required due to Triumphs "self-learning" ECU that can adapt to changes in the exhaust. When installing alongside our Competition Header it is highly recommended you seek professional help to re-tune the motorcycle.
Estimated Install Time - 30-60 minutes
View Install Guide for Bonneville Bobber / Speedmaster
Download Guide for Bonneville T100/T120