Got mine all fitted:
From what I've seen most cable ties there's to the bracket running along the side of the battery and onto the ECU, but I found if I did that the metal pipe would actually stop the bonnet from shutting properly!
So I've cable tied it down onto a hole below the metal pipe, next to the headlight - which pulls it down which I don't think will be a bad thing as there is more room and closer to the CAF.
Literally gone for a 2 minute drive, and bear in mind I've got a full straight through decat system which is seriously loud, and a stripped out interior, so I'm not going to be hear it as obvious as most!
But in my very quick blast, from 3k+ revs upwards you can hear it - a lot more noticeable with the windows down but that just due to my exhaust I think
Sounds epic though, really does sound awesome! Interestingly though it seems the noise dies down at certain revs, for example 3800-4200, but just the noise as such doesn't seem to be a flat spot
So I'll see what it's like over the next couple of days over a 100miles or so, and share my thoughts