Just updated my Q4's exhaust with a 3" section from the 'cats' (that are of course no longer there..) to the muffler. The tube was 60mm and I have now changed it to 76mm (3") - with a new 3 1/2" Magnaflow straight through race muffler..
see pic...
and how it sounds...
[ame="http://www.youtube.com/watch?v=pKxZNn0F_4k"]YouTube - ‪Alfa 155 Q4 Exhaust‬‏[/ame]
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