Inside diameter of the .060" too small to fit my stock 2016 Street Twin pipes. Emailed Tec USA and notified them of the problem but haven't received a response.
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1 of 1 people found the following review helpful:
Nice Sound
March 22, 2021
Reviewer:
Brad Flurry from San Antonio, TX United States
I bought these because I'm addicted to doing work on my bike. I have a 2019 Street Twin, and I have to say, I love the sound. It only took about 20 minutes to change them out. They are much lighter, and make the bike sound louder. Great investment.
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7 of 7 people found the following review helpful:
Street Cup
August 11, 2019
Reviewer:
Sean from Hampton , NH United States
Fit and Finish are great, I have a 2017 street cup that came with flat black mufflers that I've never liked, these look so much better. Sound's great, I've never put the baffles in, these mufflers give a much deeper, more percussive tone but are still WAY within street legal (96db in NH, last I checked). Absolutely no problem (no noticeable difference at all) with ECU/idle/throttle/Triumph "current MPG" reads the same...
Had an odd little quality-control (rivets) problem with one muffler, wasn't sure it was even worth returning, but emailed TEC about what i might do to fix it/asked if I could send some pictures, and they replied by shipping me a new one, with a return label for the old.
Absolutely recommended, great product, great company. ...And, wicked easy to install - watch the video, you'll be doing a test ride in half an hour.
Didn't fit. 
Nice Sound