2013 Audi S6 Twin Turbo V8 in Helena, MT
$21,500
Beautiful Audi S6, twin turbo V8. Upgraded RS7 turbos. 420 hp from the factory, pushing 500 now. Capable of over 600 with a tune. Car has never been tuned. Interior looks like new. Front and rear heated seats, heated steering wheel, 4 zon...