Photos Slideshow Heffner Twin-Turbo Audi R8 V10 Autoblog Staff Aug 8, 2013 Heffner Twin-Turbo Audi R8 V10 Heffner Twin-Turbo Audi R8 V10 Heffner Twin-Turbo Audi R8 V10 Heffner Twin-Turbo Audi R8 V10 facebook twitter email reddit linkedin pinterest