K&N Engineering 57-9004 User Manual

K&N Filtercharger

®

Injection Performance Kit #:

Application:

Air-flow sensing device:

This K&N Filtercharger

®

Injection Performance Kit (hereafter referred to as: FIPK) is designed to be less restrictive

than the OEM air filter system.  Low restriction air filters allow the engine to have better throttle response as well as
more power throughout the RPM band.  K&N has designed this FIPK to exactly replace the OEM factory air cleaner
case, with a precision engineered aluminum adapter and all the necessary mounting brackets, bolts, screws and nuts.
Additionally, it is important to note, if the O.E.M. air cleaner case has emission control devices and/or hoses, that all
these parts will be installed as necessary to the new assembly.

Each FIPK has a specially designed filter with woven cotton fabric sandwiched between 2 layers of wire mesh screen.
The screen and fabric combination creates a grid-like effect which actually straightens out the incoming air as it 
passes through the filter.  In addition to the filter, this kit has a uniquely designed adapter with a built-in velocity stack.
This velocity stack is beneficial in further smoothing out the incoming air flow and allowing for a less restrictive entry
into the engine. (Air moving in a straight direction moves faster than tumbling air thus creating an increase in air flow).
See the figure below.

To design an effective performance air filter assembly, two factors must be considered: the air filtering element and
the air filter adapter.  On fuel injected, computer controlled vehicles, there can be a substantial gain in performance by
using a less restrictive air filter assembly.  Original equipment air filter assemblies tend to be more restrictive than the 
performance enthusiast would like, therefore, by changing to the less restrictive K&N FIPK, the air flow potential of the
engine can be fully maximized without jeopardizing important emission standards.  (see figures below)

The FIPK is street legal for use on the emission controlled vehicles that it was originally designed to fit.  These kits
replace the original air filter case and do not eliminate the emission controls.  The high temperature label contains the
EO # assigned by C.A.R.B. that will allow a vehicle installed with the FIPK to pass the visual inspection at an 
authorized Smog Inspection station.

air sensor

stock airbox

filter element

air intake

to engine

r e s t r i c

t i

v

ea

i

r

f

l

o w

BEFORE F.I.P.K.

AFTER F.I.P.K.

air sensor

stock airbox

Filtercharger® element

to engine

unrestrictive airflow

unrestrictive airflow

1