2012-2015 Honda Civic SI High Flowing 3" Header Downpipe

High-flowing 3" Header Downpipe, which replaces BOTH OEM catalytic converters and is available catless or with a single High Flow Cat. Unleash the full power of your big displacement K engine!

Features:

• 304 stainless steel 3-inch piping
• Thick flanges of 3/8"
• Braided flex section made of premium stainless steel with an interlock lining
• Available with your preferred High Flow Catalytic Converters or Catless.
• Immediately attaches to the OEM catback exhaust position.

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