Sorry I meant the cars in the vids have they had a turbo back Blueflame fitted ? im getting a cat back and wondered if there was much difference in sound
Yes, Both Empi5's car and mine are turbo back with 100 cell race cats. Phils has an LCR dp, mine an LC.
A normal Cat is quite a silencer, it's surprising how much difference there is.
In answer to the motorway question, at high European cruising speeds it's easy to talk and hear at normal volumes. My system doesn't drone, but there is a distinct background note. The difference always come when you hit the loud pedal, then it's lovely. I'm still guilty of turning the radio off to listen 18 months after fitting.