When my first Escort Cossie let rip at about 150mph (on speedo), I never heard anything. The first thing I knew was a slight miss, then another one and then oil over the windscreen and a plume of smoke across the whole mway!!!

It all depends on what kind of speed you are doing as regards to when the DET happens, to whether or not you can hear it. (just read stu's post, so I have my Det and Pre-ign confused! )

Everytime I get anything like a missfire at high revs, my arse always goes in to overdrive!