K&N Performance Intake Kit for Ford C-Max/Focus II / Volvo C30/S40/V40/V50/V70 / Mazda 3/5 - 57S-4000 Shift Boot 5 oz capacity for extended

5 oz capacity for extended service intervals

Made from lightweight Neoprene material

Huge 5" Flange w/Inverted Top A/F

1FG is the two front sections of the Cat Back (H Pipe and Mid-Pipes)

it doesn't protect the rest of your engine from the effects of blow-by

K&N Performance Intake Kit for Ford C-Max/Focus II / Volvo C30/S40/V40/V50/V70 / Mazda 3/5 - 57S-4000 Shift Boot 5 oz capacity for extendedThe K&N 57S 4000 Performance Airbox replaces the restrictive factory air filter and air box lid. K&N performance air boxes are designed to dramatically reduce air flow restriction as well as smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The 57S 4000 Performance Airbox comes with an