High performance exhaust system developed in conjunction with Arrow Special Parts. Offers substantial weight saving and power increase over standard equipment. Features laser etched Triumph logo and fully sleeved stainless steel construction. Up to 6PS gain without dB killer (up to 1.5PS with dB killer). Approx. 40% weight saving over standard system. Suitable for all Bonneville models. Requires specific calibration to guarantee optimum performance. Not for road use.