Thought I'd bump this thread to share my eventual solution, and the various detours I took along the way. In the end, I decided I wanted a snorkel with a cyclonic pre-filter, BUT, I didn't want an OEM snorkel body. I wanted a Safari snorkel or equivalent, where I could switch out between the standard ram head and a cyclonic prefilter, with the standard 3.5 inch outer diameter on the snorkel neck like you get on a Safari snorkel. To experiment with my options, I picked up a genuine Toyota "birdfeeder" snorkel head from partsouq in a larger order, and a cheap chinese Safari snorkel ripoff from ebay that I could butcher if needed:
Once these both arrived, I discovered fitting it was going to be challenging. The bottom of the genuine cyclonic prefilter has an 85mm outer diameter, and fits inside the OEM snorkel neck. The Safari style snorkel has a neck with a 3.5 inch (88.9mm) outer diameter, so you might think you could just about slip it inside the snorkel neck, but the internal wall thickness makes that impossible. The inner edge of the snorkel neck has significant overlap with the outer edge of the prefilter outlet. I thought about making an adapter, but the problem with that is the snorkel head would sit far too high, sticking out significantly above the vehicle. The only alternative would be modify the snorkel neck, or the prefilter outlet. It looked very difficult to modify the snorkel head itself, due to the materials and construction. Since I'd got this snorkel as a disposable tester, I opted to attempt to modify the snorkel neck like
@Box Rocket reported he'd had success with. Well it didn't go so well for me. I made a bit of a mess of it. With a combination of heat, bending out, and grinding down inside, I could slip the head of the snorkel in a bit, but it still didn't go in as far as I wanted, and I was concerned I'd compromised the integrity of the neck, making it too thin or brittle. I also could no longer fit the ram head, like I wanted to be able to.
While searching for another alternative here, I came across this:
This is NOT the genuine Toyota cyclonic prefilter. It's a near perfect clone, but with one key difference: It fits over a standard 3.5 inch snorkel neck! I got it from this specific ebay listing:
There are lower quality clones out there I skipped over, but this one is really good. Pretty sure they directly moulded it off the Toyota original, and it actually cost a similar amount to the OEM one for that matter. Here's the two side by side:
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It's worth noting the thing is basically just a bit of moulded plastic. Apart from the intentional changes here, like the textured finish rather than the OEM smooth, and the different outlet style, it's a perfect clone of the original Toyota design and construction. I'd highly recommend it.
So then, with a solution worked out, I fitted a genuine Safari snorkel I'd sourced secondhand:
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Without any modification, I can now slip off the Safari ram head and fit this cyclonic prefilter instead:
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Pretty happy with the end result! It does sit around 4-5cm higher in total than the ram head, but that works for me, and you could easily "trim" the snorkel neck now to get it to sit a bit lower if you wanted. I think this aftermarket head is a really good option with no fuss for anyone else who might want this kind of thing.
