Subaru Impreza III 2.5 WRX STI panel filter Panel Filter:Panel Filter Developed and tested on Paul

Developed and tested on Paul Hamling's 390BHP record breaking Focus RS

temperatures still climb to scary levels

Alternatively some looked beautiful but lacked the desired balanced flow of a true flow of a fully balanced Tapered design and others just looked like building bricks and shouldn't grace the under bonnet of any car let alone a Ford RS

K&N's 57S Performance Airboxes increase horsepower and acceleration by dramatically reducing air flow restriction caused by the original factory design

Data logger

Subaru Impreza III 2.5 WRX STI panel filter Panel Filter:Panel Filter Developed and tested on PaulPanel type Rect. Panel Dimensions 286mmX211mm