HKS Hi Power Spec-L II Cat Back ExhaustSporty sound and significant weight reduction enhances the BRZ and 86's driving performance. By using ultra thin stainless steel material for pipes and silencers, the weight has been achieved to a level competitive with titanium exhausts. The sound characteristics of the exhaust system are emphasized by the bass sound, while the annoying exhaust drone is eliminated by the silent chamber. "It has a unique shape with equal length on each sides for