Had a 6 x 4 oval on my 16v cupra sport and it made my life a misery
It did drone on the motorway but once i got it past 4000 rpm it was pretty much silent so wasnt to bothered about that.
What did my head in was the bracket just behind the cat. Cause the exhaust was so heavy it sagged on to the bracket and made a horrible noise.
I spent about 2 years with it in and out of garages, nothing ever fixed it for more than 2 months before it would sag again and hit the bracket.
Eventually i had enough and got stealth systems in southampton to make me a custom exhaust for about 400 quid and i ditched the magnex. my new one is ace
its sounds better than the magnex and it doesnt hit or vibrate on anything.
I would never but a magnex or any other make again as its easier and less hassel to get one custom made