my old next door neighbor from many years ago was a crazy Italian.
He was the nicest bloke you could meet but his "ideas" were something else. 
I wish I could find a picture but it was so long ago. 
He had a 2.2 Audi Coupe which he claimed could do 0-60 in 4 seconds and etc. 
It had some sort of stainless steel exhaust, so he took a fire extinguisher, cut it in half and polished it.
He then took his exhaust and cut of his tail pipe and welded the top end of the extinguisher to the exhaust and refitted it.
It actually did not sound "terrible" it was just so so so loud and looked so funny. He loved it which is what counts i suppose lol. It measured over 7 inches wide. 
It was a 5 cylinder car