Here's what I've done and I'm very happy with the result. I wanted to free up the top end without losing the cold air when standing still.
The pics below show my stock airbox with the original inlet cut out completely (also resonator is removed), I fabricated a bracket out of galvanised aluminium, fixed it on with pop-rivets, cut a 100mm hole to fit a 100mm stainless steel tube (from exhaust shop) angled downwards, and I used roof and gutter silicone to hold it very firmly, then gave it a coat of matt black paint to hide it.
I bought a 100mm (4 inch) diameter x 1m long reinforced flexible rubber tube (from Clark Rubber). I used a stainless steel clamp to hold it on to the box, routed the tube downwards, under the chassis rail and then forward a little, and cut it about 200mm short of the parker light. I fastened it in place with cable ties.
How does it sound? Much quieter that an SRI pod filter, but still has a refined deep roar.
Hope this helps.
Bookmarks