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How to Install a K&N 57 Series FIPK Performance Intake on your 1991-1995 Jeep Wrangler YJ

Installation Time

1 hours

Tools Required
  • Flat blade screwdriver
  • 4mm allen hex wrench
  • 3/8" drive ratchet
  • 6" extension
  • 1/2" socket
  • 7/16" socket
  • 13mm wrench
  • 10mm wrench
  • 7/16" wrench
  • Drill
  • 1/4" drill bit
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Shop Parts in this Guide


NOTE: This kit was not designed to fit vehicles with a body lift.



1. Turn the ignition OFF and disconnect the vehicle's negative battery cable.

2. Disconnect the crank case vent hose.

3. Remove the EVAP canister vent line from the air cleaner lid

4. Loosen the hose clamp at the throttle body, then detach the stock intake tube from the throttle body as shown.

5. Unclip the three lower air cleaner retaining clamps, then remove the upper air cleaner assembly as shown.

6. Loosen and remove the two bolts that secure the lower air cleaner assembly, then remove lower airbox from vehicle.

7. Remove the upper power steering pivot bolt as shown. 

8. Using the provided hardware assemble the saddle bracket assembly as shown.

9. Using the bolt removed in step 5, secure the saddle bracket assembly to the alternator as shown, but do not tighten completely at this time. 

10. Apply the provided trim seal to the heat shield as shown and trim if necessary. 

11. Secure the rubber mounting inserts to the holes on the heat shield with the provided bolts and washer. But do not tighten.

12. Install the heat shield and insert the rubber mounting inserts into the stock air cleaner locating holes and tighten as shown.

13. Assemble the "L" bracket and the rubber mounted stud using the provided hardware as shown. 

14. Install the bracket onto the K&N heat shield and line up the bracket with the inner fender then mark the hole and drill a ¼" hole. 

15. Secure the "L" bracket to the fender using the provided hardware as shown. 

16. Install the provided silicone hose and hose clamps onto the throttle body as shown.

17. Install the K&N intake tube into the silicone hose and line up the other end of the tube with the saddle bracket, then secure the tube to the throttle body and the saddle bracket with the provided hose clamp.

18. With supplied silicone hose, make a mark at 5 inches then cut.

19. Install the 5 inch hose onto the crankcase vent, then connect the other end to the vent on the K&N intake tube as shown.

20. Assemble the remaining silicone hose and hose mender as shown.

21. Connect the hose to the vent on the K&N intake tube, then, connect the other end to the EVAP canister vent line as shown. 

22. Install the K&N Filtercharger onto the K&N intake tube and secure with the provided hose clamp as shown. 

23. Reconnect the negative battery cable and double check to make sure everything is tight and properly positioned before starting the vehicle.

24. The C.A.R.B. exemption sticker, (attached), must be visible under the hood so that an emissions inspector can see it when the vehicle is required to be tested for emissions. California requires testing every two years, other states may vary.

​25. It will be necessary for all FIPK's to be checked periodically for realignment, clearance and tightening of all connections. Failure to follow the above instructions or proper maintenance may void warranty.


1. Start the engine with the transmission in neutral or park, and the parking brake engaged. Listen for air leaks or odd noises. For air leaks secure hoses and connections. For odd noises, find cause and repair before proceeding. This kit will function identically to the factory system except for being louder and much more responsive.

2. Test drive the vehicle. Listen for odd noises or rattles and fix as necessary.

3. If road test is fine, you can now enjoy the added power and performance from your kit.

4. K&N suggests checking the Filtercharger element periodically for excessive dirt build-up. When the element becomes covered in dirt (or once a year), service it according to the instructions on the Recharger service kit, part number 99-5050 or 99-5000.