Combine intake, throttle-body, and calibration hardware in the Hybrid Racing Stage 2 package for the 2006–2011 Civic Si.
Stage 2 combines the intake upgrade with a larger OEM ZDX throttle body and the parts needed to connect it. The reinforced silicone path helps limit heat soak, the adapter and thermal gaskets support the larger throttle opening, and FlashPro provides the calibration tools to bring the combination together.
Features & specifications
Hybrid Racing 3.5-inch reinforced-silicone cold-air intake
Battery relocation tray and upper radiator hose
Air-bypass assembly with MAF and breather connections
Manufacturer intake testing reports 14 hp peak and 9 hp average gains over the stock airbox
ZDX throttle-body gains are quoted at a further 2–10 hp depending on the setup; results vary with supporting parts and calibration
Important notes
Tuning is required. Port match the RBC manifold as directed for the larger throttle body and use the appropriate MAP-based calibration. Do not use the factory calibration. Exercise caution around deep water; the bypass does not make the intake waterproof.
