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

The SPDZ1 K-Series megaphone header downpipe combines a cast bellmouth collector with 304 stainless steel tubing for the 2012–2015 Honda Civic Si and 2013–2015 Acura ILX K24. An integrated flex section accommodates exhaust movement, while dedicated sensor ports support monitoring and tuning.

Features & Specifications

• 304 stainless steel construction with mandrel-bent tubing
• Cast 4-inch bellmouth collector with 3-inch outlet
• CNC-machined flanges
• Megaphone header design
• Integrated flex section to absorb movement and vibration
• Pre-installed O2 sensor and wideband sensor bungs
• SKU: SPDZ1-SZY-176

Fitment

• 2012–2015 Honda Civic Si, ninth generation
• 2013–2015 Acura ILX with K24 engine

Confirm flange alignment, outlet connection, and sensor compatibility with your vehicle and existing exhaust before installation. The sensor bungs are ports; sensors are not listed as included.

What's Included

• SPDZ1 K-Series megaphone header downpipe with integrated flex section
• 3-bolt exhaust gasket and hardware kit