CUSTOM MODS

Twin Forced Air Induction for '97+ Grand Prix
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Installing 9" K&N Cone:

You will need something to use as an adapter between the filter and the f-tube (black accordion thing). Best option is the adapter sold by grandprixstore.com. You can also use a piece of 3" diameter x 3" long PVC tubing, or a metal 3" x3" tube. The stories about PVC melting is on vehicles that don't have an f-duct, where the PVC is closer to the throttle body and crossover pipe. Also need a roll of bailing wire (wire made for tying things), and a few long tie-wraps (zip-ties).

  1. Remove the crossbrace from the driver's side. This gives you more room to work.
  2. Open your airbox and toss the old filter. Then remove the silver pcm and set aside in engine compartment (do not disconnect wires from box).
  3. Unbolt the airbox and set in the attic in case you ever want to go back to stock. Some people find it easier to remove the f-tube from the throttle body first. Just twist and pull.
  4. Use tie-wraps to secure pcm to frame where airbox was. There are plenty of holes in the frame to use.
  5. Attach your adapter to the f-tube. Leave hose clamp a little loose for now.
  6. Attach filter to your adapter. Tighten all of the clamps so that the filter floats in the air. It should not rest on the pcm. About an inch below the crossbrace is good.
  7. If not doing the forced-air (highly recommended to do this) then re-attach crossmember. Using bailing wire or tie-wraps, tie the filter to the crossmember to prevent future sagging and loosening.
    Ta-daa!

Installing air tubes:

At Home Depot get the thickest 4" metal flexible dryer tube x atleast 6 feet long, and a roll of then bailing wire (wire made for tying things).

  1. If you just completed the cone installation then take a cookie break. If not, unbolt the crossmember and set aside to give you more room to work
  2. There is a hole on the inside left fender facing forwards. You're going to run the tube thru this. The hole is 3" wide and the tube is 4" wide. But the tube is flexible enough to fit. It's the only tough part of the job. Just push the tube thru 1 spline at a time until you've pulled enough to reach the ground.
  3. Go under the car. There is a big hole behind the left foglight. Reach up and pull the tube down to this hole. Let the bottom of the tube extend 1" below the airdam and facing forward to act as a scoop. Use bailing wire to tie in place. (When going to the track, extend the tube all the way below the car for maximum air intake).
  4. Cut the top of the tube so there is just enough to join up with the air filter by the thick end.
  5. Remove the left headlight (2 bolts).
  6. Using the remaining tubing, attach it to the backside of the hole in the frame where the headlight goes. It snaps into place like it was made for it.
  7. Extend the other end of the tube to the filter opposite the first tube. Cut short if needed.
  8. Re-attach headlight. This tube doesn't collect a lot of air but is great at the track. Removing the left headlight for racing will give a lot more air now. It also helps the first tube flow air into the filter by its location.
  9. Attach crossmember. Tie filter to crossmember using tie-wraps or bailing wire so it hangs about an inch below the crossmember.
  10. Using bailing wire, tie air tubes to the fat end of the air filter. Make it pretty! The tubes don't have to be "air-tight" against the filter. I think a little gap gives dirt a place to go other then your filter. Try to keep it under ¼" though. It helps to bend the wire in the tubing to fit the shape of the cone.
  11. Ta-daaa!!! You now have a 9" K&N cone with Twin Forced Air Induction!