Complete Parts Range
Daniel JamesDaniel James
Oct 31,2025
Verified buyer
Five Stars: Excellent Build Quality and a Perfect Fix for the P0420 CodeIf you own a $2004$-$2008$ Acura TSX, you know how frustrating it is when the notorious P0420 code (Catalyst System Efficiency Below Threshold) pops up. After comparing prices for OEM parts, I decided to give this unit a shot, and I was genuinely impressed with the quality.The construction uses 409L stainless steel, which is significantly better than mild steel and should provide excellent longevity, especially when paired with the robust stainless steel welding. The laser-cut flanges were spot-on for a direct installation—it bolted right up to the existing manifold and mid-pipe without any bending or wrestling. They even included the gaskets and hardware, which saved me a trip to the parts store.Crucially, the unit uses a large-area honeycomb ceramic substrate (as shown in the diagram), which is key to achieving the necessary high efficiency. After the install, I cleared the code, and after several drive cycles, the Check Engine Light (CEL) has stayed off. My emissions monitors are running clean, and the car's engine note and responsiveness are back to normal. This is a solid, professional-grade solution that saved me hundreds over the dealership option.
