On the road most people only see the rear of the Audi RS5 when its driver is pushing the 2,9-liter biturbo V6 with its 444 horsepower. And ABT has the perfect package to provide those left behind with a nice view.  The newly introduced RS5 rear package bundles the ABT muffler system with the carbon fiber rear spoiler for an attractive price, saving the client more than 400 US$ on the price for the single parts. The new rear muffler amplifies the charismatic sound of the V6 and changes ...