Luckily not myself but I saw it happen..
Was having a play with a silver WRX yesterday afternoon.
I passed a couple of cars up Richmond Hill, the WRX got me aswell (was quick!!) as it was a nice day I had my window fully down.
As he passed me there was a massive *BANG* and he coasted to a stop round the top of the bend.
I pulled over to give the guy a hand - very lumpy idle, kept cutting out. There was a breather pipe had come off and a lot of oil splattered around the engine - he couldn't drive it away :-(
We had to leave the car there but I gave the chap a lift home + gave him Paul's number.
Anyone that posts on here? didn't actually get his name but he was only 20, and the car started life as a GL!!
Any ideas what it may have been? The fact that it blew when he hit the limiter in 3rd wouldn't have helped tihngs