Skunk2 Pro Series Billet 74mm Throttle Body Silver - Honda K20A, K20A2, K20A3, K20Z1 - 309-05-0090 GT45 They are CNC-machined from 6061-T6

They are CNC-machined from 6061-T6 billet aluminum and then hard anodized in black and laser-etched with the AEM logo

This Overflow Tank is included in our Front Mount Intercooler Kits for the 2008-2014 WRX and STI

Each Alpha Series Radiator also includes provisions for the OEM cooling fan

Strutted tubes for maximum durability

Skunk2 Pro Series Billet 74mm Throttle Body Silver - Honda K20A, K20A2, K20A3, K20Z1 - 309-05-0090 GT45 They are CNC-machined from 6061-T6Skunk2 is proud to introduce the 74mm Pro Series Throttle Body for Honda K20A K20A2 K20A3 K20Z1 engines found in the 2002 2005 Civic Si and 2002 2006 RSX Base & Type S chassis. A larger throttle body is key to producing additional power throughout the powerband on modified engines with increased airflow demands and the Skunk2's 70mm Pro Series Throttle Body delivers! Sealed ball bearings, a precision machined throttle plate and a honed oversized bore