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Hi mate, this was a temporary thing for me as I knew I was adding turbo soon.
I just welded on a 4" pipe to the square inlet of the pizza box. Filled in the circular gaps to the square with some steel strips, welded and siliconed any pin holes as I am a hopeless welder....lol
Hey Ab, finally sourced all the parts and did my own snorkel, hard a few issues at the beginning in regards to the nutserts as I had never used them before. I have a few recommendations, If you use the one of the self made tools and use the washer method which I recommend make sure the washers are tight on the bolt as I found the loose ones made the rivets bend side ways as the pressure increased and also try them on a sheet if you've never used them before, before you drill holes in the side of your car and they're too big. I used M10 size and found if I used a 12mm hole which I belled out with the drill bit till the rivnut fit tight worked best and bites really easily. All in all a good learning curve, to cut the hole I used a pair of tin snips and drilled heaps for holes and it worked sweet as. really clean job. heres a few pics of my attempt. I had a 4" - 3" reducer at the inlet and found an extendable air hose of the net, both cost about $ 20 each. made the brackets like Ab and yea just give it a go. Heaps o fun and frustration but ultimately a good experience.
Is there any legal implications with cutting the inner guard? I always though you couldn't cut it, looks very good and something i hope to do in the future, providing it doesn't cause any problems with insurance etc.
If you take off the pre filter there is already a hole there that is 3" diameter, so no need to worry about that, im pretty sure that that is the original application for it.