PLM Downpipe 2012-2015 Honda Civic Si

The PLM Private Label Manufacturer 2012-2015 Honda Civic Si header / downpipe for the 9th Gen Civic. This header is made from high quality cast 304 stainless steel and features a large 4.25 inch bellmouth inlet with a 3.0 inch outlet, as well as a stainless flex pipe to compensate chassis movement. Considerable gains are made and this header is optimized to enhance your mid to high end power. No modifications needed this is a direct fit bolt on. This downpipe removes the catalytic converts and is considered a straight pipe and is considered for off-road use only. All bungs for 02 are there for proper afr monitoring and cat detection or lack there of. This manifold is ideal for naturally aspirated or boosted applications. Perfect for street, strip or track. Includes all gaskets and necessary hardware, as well as angled CEL adapter for secondary o2 sensor.