TEC DUELLER 2-2 Big Bore Exhaust System – Street Twin 900, Street Cup 900, T100, T120


IMPORTANT – READ BEFORE BUYING – This product is not USA 50 state compatible and cannot be used in the state of California.  The product is strictly for off-road/race/demonstration use only.  It is not road legal for emissions in the EU or the UK.  It is the customers responsibility to use this item responsibly to comply with local laws.  These parts are not BS-marked, E-marked or TUV-approved.

Awesome sound, more responsive.

Listen to our sound-test video below!

Designed and manufactured by us in 304 stainless 45mm tube.

The Big Bore pipes make your bike more responsive whilst saving considerable weight over the stock headers.

Completely bypasses Triumph’s CAT, de-restricting airflow from the engine and releasing a deeper sound.

The TEC marked silencers come supplied with TWO different sets of baffles: ‘Big-Bore’ baffles & ‘High-Flow’ baffles. Easy to swap out to modify your sound.

IMPORTANT – You MUST tell us on the notes of your order (at checkout) if your bike has a centre stand installed.  We will then ship it with the alternative fitting kit.

PLEASE NOTE – On these models, these headers & silencers can only be fitted as a full system due to the specified models using a different frame. It is not possible to fit only the headers, or only the silencers.  Similar slip-on silencers are available for the Street Twin/Cup only (please see our other listings)

Gaskets and fitting instructions included.

NOTE – On pre-2020 models, you can leave the Cat unit in place (but not connected) this allows a much quicker and easier fitting. Otherwise, the left lower frame rail needs to be loosened to allow the Cat to be removed.  We have a YouTube video showing how to remove the cat unit.

From 2021 Triumph has introduced new Euro 5 models and have started phasing in anti-tamper, welded on rear link pipes to the Cat unit on some models. If this is the case on your bike the Cat unit will have to be removed before installing the system.

THIS SYSTEM IS NOT TUV APPROVED OR E-MARKED.  As this system has no catalytic converter, it cannot be marked TUV approved.


Only 3 left in stock


Customer Reviews

Based on 16 reviews
Marco L.
TEC Dueller 2-2 Big Bore Roars!

I had fitted the slip-on mufflers previously and I been reviewing the TEC Dueller 2-2 Big Bore since it is available but only managed to purchased and finally installed it on last week when I found a reliable local mechanic in my country. Thank God that I did't do-it-myself due to my ST is Euro5 spec which the cat MUST be removed and you definitely need an EXTRA hands and PROPER tools to get the job done. Fitting the pipes was easy but PLEASE read the instructions clearly prior to installation work, alternatively watching Youtube is good enough if you are a lazy reader. Overal I am very please with the pipes installed, my ST is lighter now and (feel) more power, really roaring all the way if I rev the engine. Highly recommended to those wish to change the pipes for the sound and performance.

Graeme Heath

What a difference from the standard set up. I've got a 2022 euro 5 T120 and getting the cat out was a nightmare but installing the Tec exhaust was a doddle. So much better than the stock exhaust and looks great to.

Raymond Birch
Dueller big bore

I haven’t as yet fitted the system as I sent it off to get ceramic coated

Dmitrijs Kosteckis

Looks nice and sounds good! Would be nice with black version!!!

Stéphane Ortiz
French user so review in french !

Bonjour, pots montés sur ma T120 de 2016 avec la chicane 10 trous. Fabrication très sérieuse et montage assez simple avec quelques bases de mécanique. A l'utilisation c'est GENIAL. Bruit tout à fait contrôlé et à faible allure c'est quasi le même niveau que l'origine. A l'accélération ça rugit rauque mais à un niveau encore une fois très contrôlé. On sent que le moteur respire et il prend ses tours beaucoup plus facilement, Génial. Monté avec un filtre à air DNA, un Booster plug, et j'ai shunté les sondes lambda. Le résultat est fantastique ! Ce n'est plus la même moto...Merci à Matt