Civic SI (12-15) 3" Header Downpipe

Item # 300383

$399.00 USD

Collections: Civic Si (2012-2015) 9th Gen, Downpipe, Exhaust, Honda

Type: Civic SI 2012+

Unleash the potential of your big displacement K motor with our high flowing 3" Header Downpipe. This product eliminates BOTH OEM catalytic converters. Available Catless or with a single High Flow Cat!

Features:

3-inch 304 stainless steel piping
3/8" thick flanges
Cast stainless steel high flow bellmouth design
High quality stainless steel braided flex section with interlock liner
Available Catless, or with your choice of High Flow Catalytic Converters
Bung for OEM O2 Sensor as well as additional Bung for aftermarket O2 sensor (Plug Provided)
Bolts directly to OEM catback exhaust location

Dyno:

Max Horsepower: 206.88 whp (+20.41 whp gain)
Max Torque: 183.74 ft.lbs (+11.24 ft.lbs gain)

Note: Number on Dyno Chat is with Metal HFC and 3" CBE
With Metal Core High Flow Cat ONLY, 13-15 whp gain
With Catless version ONLY, 15-18 whp gain