Exhaust Headers for Chevrolet Cobalt SS (2004-2007) 2.0L EngineHigh Flow Exhaust Headers for 2004 2007 Chevrolet Cobalt (LSJ Delta) Replaces the restrictive factory cast iron manifold with a mandrel bent stainless steel header system to improve exhaust scavenging and reduce backpressure on the LSJ supercharged engine. The Stock Cobalt Exhaust Restriction The OEM cast iron exhaust manifold on the Ecotec LSJ is a significant bottleneck for performance. Designed primarily for manufacturing cost efficiency and rapid