This guide covers two things:
- How to replace the stock air filter with a cone filter.
- How to tap the AFM (Air Flow Meter) for the vacuum lines that were previously on the stock intake tubing.
- Cone Filter (Spectre Performance 9136 – or any shorter than 7″ / 18 cm)
- MAF Adapter (Spectre Performance 81413)
- 2.5″ to 2.75″ Coupler (Mishimoto MMCP-25275BL)
- 3x Hose Clamps
- 6 mm and 3 mm ID Vacuum Lines (Silicone or Rubber)
- 7/16″ Drill Bit
- 1/4″ NPT Tap
- 90° 1/4″ NPT Male Fitting with Barbed End
- PTFE Tape
Remove the Stock Intake
- Remove the snorkel that goes around the battery.
- Remove the stock drum style air filter canister.
- Disconnect the vacuum lines connected to the stock intake coupler.
- Disconnect the AFM’s electrical connector, and remove the AFM from the coupler.
- Remove the stock coupler from the throttle body.
- Take off the stock filter plate from the AFM.
Prepare the New Intake
- Mark a spot on the AFM where you want to tap it for the vacuum lines.
- Drill a 7/16″ hole in the AFM — start with a small drill bit and keep increasing drill bit sizes until you reach 7/16″.
- Use the NPT 1/4″ tap to tap the hole (Note: Since NPT threads are tapered you will need to decide how deep you want to tap).
- Put PTFE tape over the NPT fitting’s threads and screw it into the AFM.
- Drill holes in the AFM Adapter to match the holes on the AFM.
Install the New Intake
- Attach the AFM adapter to the AFM (Note: RTV silicone or a gasket can be used here if desired).
- Attach the cone filter to the AFM adapter, and tighten down a hose clamp over it.
- Connect the 2.75″ side of the new coupler to the AFM.
- Connect everything to the throttle body using the 2.5″ side of the new coupler.
- Tighten down two hose clamps on the new coupler to secure it.
- Connect a 6 mm vacuum line to the barb on the AFM.
- Connect a Y junction to the 6 mm vacuum line.
- Connect one side of the Y junction to the AC VSV (Air Conditioning Vacuum Switch Valve) using a 6 mm vacuum line.
- Connect the remaining side of the Y junction to the Idle-Up VSV using a 3 mm vacuum line.
- Secure the new intake however you see fit (the coupler is strong enough on its own but you may want to help support it).
- Start up the car and enjoy the new intake sounds.