1. Helping the engine to absorb colder air with result in better throttle response and higher horsepower performance.
| Model | Type |
|---|---|
| WRX | 2.4 TS(VB) GAS AT (TAIWAN) FA24 ENGINE 2023- |
| WRX | 2.4T - MT (USA) FA24 Engine 2022- |
| WRX WAGON | 2.4 TS (VN) GAS AT (TAIWAN) (FA24 ENGINE) 2023-on |
