im assuming that your iS came with the m-tec kit from the factory so it would have the single exhaust cut out?
if that is the case then you can cut the diffuser or you can get another m-tec diffuser from the like of a 328 sport or an m3 and fit that instead :thumbsup
spot on disco, i had a closer look at the diffuser and it has a very faint line as if to show ''this is where you ment to cut if you want to put a twin exhaust on''.....is that correct.
I would purchase a twin exit diffuser and sell your single exit one or even keep hold of it incase you would like to swap back at any point in time:thumbsup
i had this problem when i was looking for a spare one as well but i managed to get one from a memeber on here
try one of the forum vendors, quarry motors and scrap yards
i remember seeing euro car parts selling them a while ago the were going for about £80 iirc
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