I have a Scorpion Boxer cat-back exhaust on my 1.2 16v and it started off quite quiet but its got loude, but its actually the deepest exhaust Ive ever heard! Closest thing is a TVR. ITs a really deep hum/grumble throughout the rev range. It pops on the over-run and definitely gives more mid-range pull, but at the expense of low down torque. Result is its slower off the mark, but faster for over-taking. All in all, its a nice exhaust and I would choose Scorpion for my next car all the way (well maybe Id consider a Mongoose as well actually!).