New Gen4 Snorkel

Scrub my second suggestion, the air outlet gets in the way. That leaves PVC guttering downpipe. This is available in round or square, both approx. 65mm. Both of these pipes will flow appreciably more air than the Suzuki original so if you can find a supply of smaller diameter pipe then you may find it easier to fit the space available. The square pipe can be had with adaptors to fit round pipe.

Roger

I was going to say, there is no room at the back of the airbox.

I have a couple more things to try next, will keep you posted.

So tonight on my way to Morrisons, I removed the convoluted pipe from the bottom of the snorkel and just left tucked in by the battery. The harmonic vibration did not occur,  it had gone away. This still leaves two possibilities:

1. It is the harmonics within the snorkel itself causing the noise and not the pipe.
2. The noise is caused within the pipe and the snorkel just amplifies it like a gramophone horn.

At the moment I am swayed towards N⁰1. I think if it was the pipe, I would still hear it, but somewhat muted by the bulkhead. 

I am beginning to think it could be the shape at the base of the snorkel, the way the airflow is split at the base? Just a theory?

 

 

How thick is the wall section of the flexible pipe? I know it's supposed to be flexible by nature but it looks like it would begin to resonate with the intake without too much effort. I might suggest looking at a suitable diameter piece of twin wall conduit as it will take a fairly tight bend but it's smooth inside and quite rigid for what it is.

That kinky bend at the base of the snorkel will do you no favours. Any bend that creates very sharp kinks with variable cross sectional areas will create buffeting and that means noise. Combine that with the very basic flexi. hose and noise is inevitable. I used 75 mm bore twin wall flexi. to join my 3 way air valve that enabled me to use air from the passenger compartment when I needed a snorkel. The rest of the time air was drawn in from the double skinned wing panel. This was on my LC. You could try a suitably sized twin wall flexi. It will certainly be better that what you have. There is a dealer in Redditch who supplied me and I could have a look to see what he has to offer if my idea seems ok to you.

Roger

I am also suspicious of the flexible pipe. Is it possible the shape at the bottom of the intake pipe is a restriction, this is causing the flexible pipe to contract/expand like an accordion. You see this effect it you block the flexible pipe on a vacuum cleaner.
Maybe try a few extra fixings to stop it contacting or fit a small camera under the bonnet and film it, see what's happening.