SUPER MANIFOLD with CATALYZER GT-SPEC for ZN6/ZC633005 AT007 The exhaust manifold of 86 BRZ is very important for higher power. Stock exhaust manifold has a catalyzer and it's causing a resistance for exhaust output that make the engine to perform poorly. HKS SUPER MANIFOLD with CATALYZER GT SPEC for ZN6 ZC6 uses a compact and high cleaning capacity catalyzer, still it has a low resistance which passes Japan Exhaust Gas Regulation. It's a high and efficient performance manifold for your 86 BRZ.