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How to Install a K&N Drop-In Replacement Air Filter on Your 1987-1993 4 Cyl Mustang

Installation Time

1 hours

American Muscle
Shop Parts in this Guide

Installation

Installation

Congratulations, you have purchased the finest air filter that money can buy. With proper care, this filter will last 1 million miles or more. This filter is a direct replacement for the stock air filter, and no modifications will be required. However the following procedure MUST be followed to ensure a proper fit and seal of the K&N Air Filter.

INSTALLATION INSTRUCTIONS

INSTALLATION


NOTE: Some models may not use a reserve chamber

  1. Loosen the hose clamps on the main intake hose that connects the airbox to the engine.
  2. Remove the bolts in the airbox lid.
  3. Loosen the hose clamps on the hose that hooks the airbox to the reserve chamber above the raidiator.
  4. Lift the airbox lid up and remove the stock filter.
  5. Install the K&N Air Filter into the lid of the airbox. Be certain it is properly seated .
  6. Re-install the airbox cover and the reserve hose.
  7. Tighten the bolts in the airbox lid.
  8. Tighten the hose clamps on the reserve hose.
  9. Tighten the hose clamps on the main intake hose.

THESE INSTRUCTIONS MUST BE FOLLOWED EVERY TIME THE FILTER IS SERVICED, OTHERWISE THE FILTER MAY NOT SEAL, AND DAMAGE TO THE ENGINE COULD RESULT ​ 


This guide applies to Mustang years: 1987, 1988, 1989, 1990, 1991, 1992, 1993 and Submodels: Foxbody

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