PLM Power Driven K-Series Header Downpipe with High-Flow Cat – 2012–2015 Civic Si FG4 & 2013–2015 Acura ILX

PLM Power Driven K-Series Header Downpipe with High-Flow Cat – 2012–2015 Civic Si FG4 & 2013–2015 Acura ILX

SKU: PLM-HFG4-HEADER-CAT

Product Description

The PLM Power Driven K-Series Header Downpipe is designed specifically for the 9th Generation Honda Civic Si FG4 and Acura ILX, offering a direct bolt-on performance upgrade with exceptional fitment and flow. Engineered to replace the restrictive factory downpipe, this high-performance unit features a large 4.25-inch bellmouth design paired with a 3-inch outlet to significantly improve exhaust flow, throttle response, and overall power delivery.

Constructed from high-quality stainless steel, this one-piece downpipe integrates a high-flow 200-cell metallic core catalytic converter that balances performance gains with emissions-conscious design. Precision CNC mandrel-bent tubing, a high-grade cast bellmouth section, and TIG-welded construction ensure durability under high heat and aggressive driving conditions. Designed to bolt directly to the OEM cat-back exhaust location, this downpipe requires no cutting or fabrication, making installation straightforward and hassle-free.

Whether you’re upgrading for performance, sound, or reliability, the original PLM Power Driven downpipe delivers proven results and excellent value for K-series enthusiasts.

Key Features

• High-flow 200-cell metallic core catalytic converter

• Large 4.25-inch bellmouth design for improved exhaust scavenging

• 3-inch outlet for increased exhaust flow

• One-piece stainless steel construction

• Precision CNC mandrel-bent tubing

• High-grade cast bellmouth section

• Braided flex pipe with interlock liner for durability

• CNC-machined 3/8-inch thick flanges

• Includes gaskets and all necessary hardware

• Includes O2 sensor adapter

• OEM O2 sensor bungs plus additional wideband O2 bung

• Direct bolt-on installation to OEM cat-back exhaust

Vehicle Fitment

• 2012–2015 Honda Civic Si

  • 9th Generation FG4

• 2013–2015 Acura ILX

Installation Notes

• Direct bolt-on design, no modifications required

• Designed to mate with factory cat-back exhaust systems

• Professional installation recommended

• Emissions regulations vary by location—verify local compliance before installation