1999-00 Mustang Side Exhaust Installation

1999-00 Mustang Side Exhaust Installation - Remove plastic strip along top of rocker. Access by opening door

Remove Stock Side Rocker Moldings:

  1. Remove plastic strip along top of rocker. Access by opening door.
  2. Remove Christmas tree fasteners along bottom of rockers at pinch weld, save for re-use.
  3. Remove screws form end of rockers one in each well opening. Top edge of rockers between front wheel opening and door and rear wheel opening and door is held on with aggressive clips, you will have to get a good grip and pull upward and out from vehicle. Remove all clips from car body.

Check fit of Classic Exhaust Rockers to the Body.

Make sure two screw holes in wheel openings and holes for plastic securing strip in door opening, line up with holes in the body.
Fit front and rear spatz to car, using stock screw in wheel opening. Note: Rear spatz only on Cobra.

Paint Classic Exhaust Rockers andSpatz.

Note: To maintain the quality appearance of product and vehicle, have your kit painted by a professional automotive paint facility.

Remove Stock Exhaust.

  • Cut tail pipe over axle with sawsall and remove tail pipe (unless you are changing springs, you will not be able to remove exhaust system whole.)
  • Unbolt stock exhaust form the "H" pipe and slide rear hangers off their rubber grommets, and you will reuse the upper grommet only.
  • Clean areas behind front wheel openings and in front of rear wheel openings where acrylic tape contacts the car and wipe with isopropyl (rubbing) alcohol to remove any wax.
  • Pull red backing off of acrylic tape, line up rocker covers to body & screw holes and press into place. Install screws, plastic strip and Christmas tree fasteners; do not install a Christmas tree fastener in the rear most rocker hole.
  • Install front and rear spatz: remember to clean area with isopropyl alcohol. Attach spatz to fasica using stock screw in wheel opening, peel red backing off and adhere to fascia. Drill ¼" hole into bottom of fascia where spatz tabs contact and install Christmas tree push pins supplied with kit. Repeat process at all corners.
  • Bolt cast aluminum tips to the 2 rear most pinch weld holes using 5/16" x 2" bolts. Use washers to shim tip to desired depth in rocker opening.
  • Place Classic Exhaust System tail pipe into tip and rotate assembly into place. Place muffler hanger into stock rubber grommet. Connect intermediate pipe to vehicles "H" pipe do not tighten yet.
  • Tighten exhaust system at "H" pipe. Tighten clamps at intermediate pipe maintaining approximately 1" clearance between tail pipe and floor pan. Check tip alignment adjust if necessary install _" x 1" x 20" jamb bolts into each side of tip, use a thread locker on bolt.
  • Install steel muffler hanger on passenger side with nuts and bolts supplied. The location holes are directly opposite of driver sides. Holes are already in body. There are 2 rubber grommets on driver side use 1 for driver and the other for passenger.
  • Bolt cast aluminum tips to the rear most pinch weld holes using 5/16" x 2" bolts. Use washers to shim tip to desired depth in rocker opening.
  • Place Classic tail pipe into tip and rotate muffler into place. Place rear muffler hanger into rubber grommet. Repeat for other side.
  • With both mufflers in tips and rubber grommets, slide "Y" pipe over intermediate pipes (forward facing pipes from mufflers) and attach "Y" pipe to stock "Y" pipe.
  • Tighten exhaust system at "Y" pipe. Clamps on intermediate pipes maintain approximately 1" clearance between tail pipe and floor pan. Check tip alignment, adjust if necessary. Install _" x 1" x 20" jamb bolts into each side of tip, use a thread locker on bolt.


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  • Remove Stock Side Rocker Moldings:

  • Contents of Box:

    • Aero Shield, Molded Urethane, 27" x 66".
    • Installation Instructions.

    Installation Steps:

    1. Paint Aero Shield with flexible paint of the same type used for Mustang bumper covers & Classic Side Pipe Covers. [The Aero Shield can be effectively integrated if it is two-toned to match the rear bumper insert. Consider low gloss black, like the GT series, for light colors, or light argent (silver) for dark colors.]
    2. Your fuel gauge should read 1/8 or less. Gas is heavy; a light tank makes for an easier installation.
    3. Raise car. The Aero Shield can be installed on a driveway apron, jack stands are better, a hoist is best.
    4. Remove the two rear wheel/tire assemblies.
    5. Remove the black vacuum formed plastic tub from under the fuel tank:
  • Mustang Light Bar

  • Classic Design Concepts
    1999 - 2000 Mustang Hood Scoop Instructions:

    1. Place Hood Scoop on hood and check fit before painting.
  • One of the oldest appearance mods for fox body stangs is to install a set of LX tail lights.

  • Vehicles Equipped with Stock Fog Lamps:

    1. Remove the stock fog lamp assembly from fascia, save stock bolts for reuse.
    1. Open Trunk.
    2. Remove four (4) "Christmas Tree" pushpins that hold plastic trim panel at striker plate and remove plastic trim.
    3. Remove two (2) plastic speed nuts (phillips head) one per side, directly behind each taillight in trunk. Remove trunk panel.
    4. Remove four (4) nuts per taillight housing (11 mm).
    5. Unplug wiring harness (one connection per light).
    6. Push grommets (one per light) with wiring harness through the sheet metal from inside to outside of trunk.
    7. Remove taillight housings from vehicle.
    8. With taillights on bench, remove bulbs and sockets from lights and remove harnesses completely.
    9. Install bulbs in modified harnesses (make sure to wipe bulbs with isopropyl alcohol to avoid bulb burnout from hand grease).
    10. Connect backup light bulbs and sockets to the lamp bodies first, then connect bulbs/sockets marked 1, then 2, and then J.