Im only selling this to someone who is willing to part for their stock system in order for you to have this one . So this is a trade & cash deal . The system has only 10k on it and 1 yr .Bolts-in directly to your exhaust manifolds. Replaces your OEM primary cat with a 200-cell platinum-coated metal high-flow cat and eliminates your OEM secondary cat. Dyno proven to deliver 20 lb-ft and 15hp at the wheels. When combined with the Milltek catback your S4 jumps by 40 lb-ft and 30hp at the wheels. More torque, more power, more growl. An unbeatable combination for the spectacular 4.2 V8 S4 . I Purchased from Stratmostphere, paid over $2000 for just the downpipes.. & $1400 for the cat-back . MY LOSS YOUR GAIN... Oh Btw its for a Tiptronic S4 .http://newyork.craigslist.org/stn/pts/1977406903.html