Exhaust Headers for Volkswagen Jetta Golf (1988-1999) 1.8L 2.0L EnginesHigh Flow Mandrel Bent Exhaust Headers for 1988 1999 Volkswagen Jetta, Golf (ABA ACC Mk2 Mk3) What it Does: Replaces the restrictive factory cast iron manifold with high velocity T 304 stainless steel primaries to improve exhaust scavenging and reduce backpressure on 8 valve SOHC engines. The Stock Jetta, Golf Exhaust Manifold Bottleneck The factory exhaust manifold on the Mk2 and Mk3 Volkswagen 1. 8L and 2. 0L platforms is a primary point of