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 modifcations 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 apsirated 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.
Overview: One year limited warranty
One piece design made of High Quality 304 Stainless steel
Race Header "no cat"
CNC Machined manifold flange Flange is .38" or 3/8" thick Bolts directly to OEM catback exhaust and aftermarket
Large 4.25 inch Bellmouth Design Manufactured from High Quality Cast Steel & Flexpipe
Precision CNC Mandrel Bends Bungs for OEM O2 Sensors & ADDITIONAL Bung FOR WIDEBAND
Replacement Grade 8 NUTS AND BOLTS TO CONNECT TO CATBACK
FREE ANGLED CEL-FIX