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Enlarging EL/AU 55mm airbox lid adaptor 


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 Post subject: Enlarging EL/AU 55mm airbox lid adaptor
Posted: Mon Mar 24, 2008 6:04 pm 
Getting Side Ways
User avatar

Posts: 887

Joined: 8th Aug 2006

Ride: Falcon

Location: Central Highlands
QLD, Australia

Most people are aware that on 6cyl EL/AU falcons the airbox lid has an outlet of 55mm which is a restriction. Most probably ford used to keep induction noises down.


By removing the inner rubber pipe you can increase the diameter of the exit to approx 66mm-70mm. This will result with better throttle response and mid-top end power.

Step1- Remove the 4 bolt adaptor (8mm bolts)

Step2- Screw 4bolt adaptor onto wooden block or hold in vice.

Step3- now use a holesaw approx 66-70mm and drill out the inner pipe. Making sure you don't scuff the outer rubber lip and leaving the internal bellmouth undamaged.


Step4- Bolt airbox adaptor back on lid and enjoy.

Pics below use a golf ball as a comparison of size.







97 EL Fairmont 4l OHC .Silver.
Exhaust: Pacemaker's, 2.5" exhaust and Hiflow cat
Intake: FRAM AIRHOG , EL GT snorkel
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PM in Qld looking too buy Toyota 4*4 SR5 Dualcab Hilux 91-97 with 2.8l diesel engine/5spd manual

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