SPDZ1 Header Downpipe | 12–15 Civic Si / 13–15 ILX K24

The SPDZ1 K-Series header downpipe combines 304 stainless steel tubing, TIG-welded joints, and CNC-machined flanges for the 2012–2015 Honda Civic Si and 2013–2015 Acura ILX K24. Its bellmouth collector transitions to a 3-inch outlet, while an integrated flex section accommodates exhaust movement and vibration.

Features & Specifications

• 304 stainless steel construction
• TIG-welded joints and mandrel-bent tubing
• 4-inch cast bellmouth collector with 3-inch outlet
• CNC-machined manifold flanges
• Integrated flex section
• O2 and wideband sensor ports
• SKU: SZY-019-BASE
• 1-year manufacturer warranty

Fitment

• 2012–2015 Honda Civic Si, coupe and sedan
• 2013–2015 Acura ILX K24

Designed to connect to the factory or compatible aftermarket cat-back exhaust. Confirm flange alignment, connections, and sensor requirements for your specific setup before installation.

What's Included

• SPDZ1 K-Series header downpipe
• Gasket and installation hardware
• O2 plugs
• 90-degree O2 spacer