Thanks Davo for that link. I nicked up to our local Clark Rubber store this weekend and purchased a few metres of that stuff - Was a bit skeptical, as it looked pretty simple, but even though i've only half-done the job, the difference is quite remarkable...
Basically spent the weekend painting the front floor and tranny tunnel (and as much of the firewall as I could reach) with bitumen paint, then covering the tunnel/firewall with flashtac, and then a good solid layer of Form Shield over the tunnel and loose mats on both floors, followed by some marine carpet on both footwells and the original rubber mats back over the tunnel area...
Fired it up yesterday and was amazed. Noticeably quieter (which I hoped for, but didn't really expect), but more importantly all the higher pitched rattly stuff is gone, so what noise is left is a deeper rumble, which is much more acceptable... Makes the car sound more like one piece, rather than several thousand loosly bolted together!
Next step is to do basically every floor/seat surface in the same way. Seatbox, rear floor, under the rear seats, etc., and then another kind of insulation in between the roof lining and the roof when I replace the lining soon...
