Joined: 8th Aug 2006
Location: Central Highlands
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.
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