Porsche 991 GT3/RS/911R - Valved Middle Silencer Delete PipesFits all Porsche 991. 1 991. 2 GT3 and GT3RS models (and the 911R) **Also Fits 997 GT3 RS** Weighs 15. 6kg (34. 4lbs) less than factory middle side mufflers (19. 8kg Stock vs 4. 2kg Capristo) This modular CAPRISTO performance system is intended to increase between power, drive ability and sound quality, without forgetting of course a substantial loss of weight. All of this is delivered while maintaining the CAPRISTO best of both worlds philosophy