I have an Invidia N1 installed by previous owner. The quality of the exhaust itself is very good, fitment and install are both great - No problems at all. The sound is the best part though... Very loud, if thats what you're looking for but the sound is the best part in my opinion! Actually got pulled over for cruising at about 55mph on the highway because the exhaust was "excessively loud"... Can't speak for the Cobb, but I've heard good things also. I bet you'll be happy either way.