Cab vs Coupe exaust
 

My buddy just bought an 2015 a5 cab, I have a 2015 coupe, both are Premium +, mine has the sport package. I noticed his exaust outlets are on either side, mine are both on the drivers side, and his look to be a bigger diameter. Are there different exaust systems used between cabriolet and coupe?

yes... as you can see from comparing the two. Both can be modified to a dual quad set-up using the S5 valance, if you so choose, or you can get the 15 cab rear valance and add single dual to yours.