3.5-Inch Stainless Steel O2 Housing & Downpipe Assembly

The Modern Performance MPX-CSRT4-DP is a 3.5-inch O2 housing and downpipe assembly designed for the 2008-2009 Dodge Caliber SRT-4.

This performance downpipe replaces both of the factory catalytic converters, which are known to restrict exhaust flow and reduce power. Constructed from high-grade stainless steel piping, flanges, and triple-layer mesh flex joints, it features fully MIG-welded construction with production jigs for consistency. The assembly includes high-flow, street-legal catalytic converters from Vibrant Performance and a steel reinforcement bracket to alleviate stress from engine movement. It weighs approximately 9 lbs, significantly less than the factory assembly.