This is probably a real noob question, and a definite candidate for Occhums Razor law, however..

The last couple of days, I've noticed on first start up (engine cold), that it's a bit noiser - like the exhaust is blowing or has a hole in it - seems to disappear when the engine has warmed up, so I'm wondering if anyone can point me in the direction of what it could be ?

I see a lot of posts about EGR valve's, but to be honest, i wouldn't know an EGR valve if I caught it in bed with my wife...

Can anyone help ? Also, given I'm prone to stabbing myself with spanners when attempting mechanical work, ballpark costs ?

Thanks for a complete noob.

edit - VX 1.8 vvt ..