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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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pdlouche
Since the Vortex ECU install I've been on the hunt for one. Buying new from the US was eye-watering, when you factor in shipping/customs, so pleased to nab this second hand. Couldn't really notice any performance gains from my short test but the weight saving was a shock! Glad I went for the Q(uiet)4, as no doubt a loud pipe would soon get old on the local lanes.