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This K&N air intake system was designed to increase vehicle power and acceleration by
reducing restriction in the intake path. The K&N 77-1553KP air intake system fits 2007,
2008, 2009, 2010 and 2011 Jeep Wrangler models with 3.8 liter engines. The 77-1553KP air
intake system is 50 state street legal (CARB exempt) for some vehicles but it is not legal
for highway use in California and other states adopting California emission standards on
other vehicles. To determine a specific vehicle’s CARB status for an intake go to KNFilters.com
or the K&N catalog to search by vehicle.
K&N power testing showed an estimated power gain of 7 horsepower at 4807 RPM with the
77-1553KP air intake installed on a 2007 Jeep Wrangler with a 3.8 liter engine. Actual results
will vary depending on the condition of the vehicle, mileage, weather and other variables.
With the air intake installed we ran the vehicle on the dyno to test the sound comparison verses
the stock intake. The intake kit includes components that have
been designed or matched to the needs of these vehicles to produce a safe horsepower increase.
Detailed installation instructions are included with this kit.
The tools needed for this install are shown.
Turn off the ignition and disconnect the negative battery cable.
Release the locking tab on the air temperature sensor electrical connector then disconnect
the connection.
Disconnect the crank case vent hose from the stock intake tube.
Loosen the hose clamp that secures the stock intake tube to the throttle body then disconnect
the intake tube from the throttle body.
Lift up the air box assembly to dislodge it from the mounting grommets then remove the
complete assembly from the vehicle.
Install the supplied grommet into the hole in the intake tube.
Carefully remove the fragile air temperature sensor from the stock intake tube.
Carefully install the fragile air temperature sensor into the grommet installed in the intake
tube during step #6.
Install the supplied silicone hose onto the throttle body and secure it with the supplied
hose clamp.
Remove the front engine bolt and set it aside as it will be reused.
Install the supplied tube mounting bracket onto the engine and secure with the bolt removed
in step #10 making sure the bracket sits flush to the engine.
Remove the power steering reservoir mounting bolt and the two air box bracket mounting
bolts.
Install the supplied edge trim onto the heat shield and trim as necessary.
Install the supplied rubber mounted stud onto the heat shield with the provided hardware.
Install the supplied bracket onto the rubber mounted stud.
Install the supplied small “L” bracket onto the heat shield with the provided hardware.
Install the supplied “L” bracket onto the heat shield with the provided hardware.
Install the heat shield assembly into the engine compartment and secure with the three
bolts removed in step #12.
Insert the intake tube into the silicone hose at the throttle body and align with the mounting
bracket installed in step #11 then secure with the hose clamps provided.
Connect the crank case vent hose to the intake tube.
Install the K&N air filter and secure with provided hose clamp.
Reconnect the air temperature sensor electrical connection.
Reconnect the vehicle’s negative battery cable. Double check to make sure everything
is tight and properly positioned before starting the vehicle.
It will be necessary for all K&N high flow air intake systems to be checked periodically
for realignment, clearance and tightening of all connections. Failure to follow the
above instructions or proper maintenance may void warranty.
K&N makes products for nearly every vehicle on the road. The K&N website allows you to
search products by vehicle or dimension, download installation instructions, view dyno charts
showing estimated horsepower gains for this product, and view product details. For information
on where to buy K&N products, go to knfilters.com.