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Stock Replacement Filters |
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We manufacture stock
replacement air filters to fit most vehicles on the road today. These
filters are designed to replace the factory air filter that came with
your car. They fit into the factory air box and are engineered to seal
tightly with no air leakage. These filters are made with the same filter
media used in our racing filters and put a little bit of performance
into your every day driving experience. Our stock replacement filters
are backed by our Million Mile Limited Warranty and are emissions legal
in all 50 states.
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Our stock replacement
air filters are washable, reusable and can handle all driving
conditions. Water will not damage their performance and with proper
cleaning, they will last the life of your engine. And of course, they
offer high air flow and that means performance!
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replacement air filters are designed to provide up to a 4% increase in
horsepower and torque. The amount of performance gain varies from
vehicle to vehicle based on the overall factory air intake design. The
greater the restriction created by the stock paper element, the greater
the potential performance gain when you switch to a K&N. |
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The airflow comparison
charts below are for two individual stock replacement air filters sold
by K&N. The tests were performed in a dust-free environment on
laboratory equipment. Flow comparison results will vary depending on
part number, vehicle application and barometric air pressure. For a
complete description of the air flow testing method used by K&N to
develop the information in the charts below and other published air flow
results, see the below “K&N Air Flow Testing.” |
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K&N
ENGINEERING AIRFLOW TESTING PROTOCOL |
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| K&N Engineering
performs all airflow testing on a SuperFlow Corporation SF-1020 flow
bench. The SF-1020 is a computerized flow bench capable of measuring
airflow rates up to 1020 cubic feet per minute (cfm) at test pressures
of up to 50 inches of water. |
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The procedure K&N has
developed for performing airflow testing is as follows:
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| 1) Check SF-1020
calibration using the test orifice plate supplied by the manufacturer.
The airflow through the test orifice plate, with both the 1.875 and the
.312 holes open, at 10”, 25” and 50” of H2O pressure differentials
should read as follows: 10”=150 cfm, 25”=240 cfm and 50”=340 cfm. This
calibration check shall be performed before testing has begun in the
morning and also before the afternoon test session. |
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| 2) For testing round
or flanged conical air filters, one of three radiused entry plates will
be installed on the air intake duct of the SF-1020. A plate will be
selected with an entry diameter closest to the inside diameter of the
filter. These plates have hole diameters of 5”, 7.375” and 10” with a
.250” entry radius and incorporate a Dwyer Instruments 166-12 pilot /
static pressure tube to read the static pressure inside the filter
element. The filter to be tested is to be centered over the hole in the
entry plate. An appropriate diameter, 0.250” thick, aluminum top plate
is used to seal the top of round air filters. |
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| 3) For testing flat
panel air filters, the panel filter air box will be installed on the air
intake duct of the SF-1020. The plenum of the box measures 17” long x
10.5” wide x 5.75” deep. The bottom of the box has a 9” diameter hole
with a 0.500” entry radius. A Dwyer 166-12 pilot/static tube is
positioned in the lower corner of the plenum. The top of the box
features 4 adjustable slides to accommodate various size panel filters.
The panel air filter to be tested is to be placed in the air box and the
slides adjusted to provide a positive seal on all 4 sides. |
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| 4) Connect the static
pressure tap of the SF-1020 to the static pressure side of the Dwyer
166-12 ( the pilot tube tap of Dwyer 166-12 is to be capped ). |
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| 5) Program the SF-1020
flow computer to maintain a test pressure of -1.5” H2O. |
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| 6) To determine the
appropriate flow range for the filter under test, a preliminary flow
test must be performed. Select flow range #10 (1000 cfm ) Start the flow
bench motor and allow the test pressure to stabilize at –1.5” H2O.
Observe the cfm reading on the digital readout. Shut off the flow bench
motor and select the flow range that is one step higher than the
preliminary test reading. |
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| 7) The airflow test
may now be run. Push the motor start switch. Allow the test pressure to
stabilize at –1.5” H20. The operator will then freeze the digital
display reading at exactly –1.50” H2O and record the cfm reading.
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