Skunk2 309-05-1070 Alpha Series 74mm Throttle Body for 02-05 Civic Si/0

Vehicle Fitment

• 2002-2005 Honda Civic Si (K20A3 2.0 L I4, DOHC VTEC)
• 2002-2006 Acura RSX Type S/Base (K20A/K20Z1 2.0 L I4, DOHC VTEC)

Features

• Alpha Series 74 mm throttle body designed for high-flow performance
• Die-cast aluminum housing for lightweight strength and durability
• Precision-machined brass throttle plate for smooth control
• Sealed ball bearings ensure consistent operation and reduce wear
• Fine shot-blasted finish enhances appearance and corrosion resistance
• Includes throttle body gasket and mounting hardware for easy installation
• Compatible with OEM throttle cable for straightforward bolt-on fitment
• Dual bolt patterns support multiple intake manifold designs

Specifications

• Part Number: 309-05-1070
• Throttle Bore: 74 mm
• Material: Die-cast aluminum
• Throttle Plate: Machined brass
• Bearings: Sealed ball bearings
• Finish: Shot-blasted aluminum
• Fitment: 2002-2005 Civic Si / 2002-2006 RSX (K-Series engines)
• Installation: Direct bolt-on with included gasket and hardware

Included Components

• 1x 74 mm Alpha Series throttle body
• 1x Throttle body gasket
• Mounting hardware kit

Product Description

The Skunk2 309-05-1070 Alpha Series 74 mm Throttle Body is a high-flow upgrade engineered for the 2002-2005 Honda Civic Si and 2002-2006 Acura RSX with K-Series engines. The larger 74 mm bore increases airflow into the engine, improving throttle response and supporting higher horsepower gains on modified or naturally aspirated engines. The die-cast aluminum housing is lightweight yet durable, while the precision-machined brass throttle plate and sealed ball bearings provide smooth, reliable operation.

Installation is simple with included gasket and mounting hardware, and the throttle body maintains OEM throttle cable compatibility. Dual bolt patterns support multiple intake manifold designs, but proper fitment requires an intake manifold flange matched to the 74 mm bore for correct idle air control and sealing. Ideal for performance builds, this Alpha Series throttle body enhances engine efficiency, rev response, and overall performance on Civic Si and RSX platforms.