The latest production run of Street Thunder slip-on and full-system exhausts is now shipping with a revised baffle architecture that reduces wide-open-throttle dB output by an average of 2.8 dBA while preserving the characteristically low-RPM growl riders have come to expect. The change follows the completion of homologation testing under the new UNECE R41-05 noise standard, enabling legal use in all EU member states without additional paperwork.

Key technical adjustments include a dual-stage perforated-core wrapped in higher-density basalt wool, plus a minor taper to the exit cone that smooths pulse reflection. Flow bench data shows a 1.6 % increase in volumetric throughput at 8 000 rpm versus the previous model. Dyno validation on a 1200 cc V-twin platform indicates a repeatable 1.9 bhp gain at peak and a marginal torque lift of 0.8 Nm in the 3 200–3 800 rpm range.

Finish options remain brushed stainless, mirror-polished, and matte-black ceramic. All units now ship with a replaceable dB-killer insert and a fresh set of high-temp Viton O-rings. Packaging has been downsized by 18 % to cut freight emissions; the cardboard is FSC-certified and fully curb-side recyclable.

Dealers will begin receiving replenishment stock this week. End-users can verify batch authenticity via the laser-etched QR code on the mounting flange, which links to a digital installation guide and warranty registration. Existing owners retain upgrade eligibility at a discounted rate under the TorqueForge Continuous Improvement programme; contact customer support with proof of purchase for details.