Hey guys.

I've found that when I rev to 4k+, as the revs drop back down, it sounds as though something is rattling and making a noise in the engine bay. I haven't tried popping my head in the bay to see where its coming from yet but it's only audible when it's returning to idle speed after revving, and when I'm decreasing speed when riding gears down (using the straight-shifter)

Do they usually sound like this? Is it an easy fix if so?

Could be something in between your V block.. dropped a bolt in mine the other day... its driving me frigging insane! Else rattly exhaust manifold? Mine did this also until I resolved it today :) heat shields are terrible for getting rocks stuck in them!