Re: Phizzing noise from engine bay!
the PS pump gives a more prominant whine noise with higher revs when its bearings are on their way out, and the more your engine revs the faster the PS pump is turned, hence more noise. mine has made a whiney noise for 2 years now and never given me any trouble. maybe you could check/replace the power steering fluid first see if it help. if the steering at low speed feels fine then i wouldnt worry about it, unless you really dislike the noise, i kinda like it, it adds 'character' to what is already a bloody musical engine!
and amir, yes, the catalytic converter brackets. there is a history of the exhaust manifold bracket failing, it can run perfect for a very very long time with this bracket simply removed!!!