Exhaust Headers for Toyota MR2 (1999-2007) 1.8L EngineHigh Flow 4 2 Exhaust Headers for 1999 2007 Toyota MR2 (1ZZ FE ZZW30) Replaces the restrictive factory manifold to improve exhaust scavenging and eliminate the risk of catastrophic pre catalytic converter failure in the 1ZZ FE engine. The Stock MR2 Manifold Bottleneck The factory exhaust manifold on the Toyota 1ZZ FE engine is a well documented failure point for the ZZW30 chassis. The OEM cast iron unit features integrated ceramic pre catalytic