Just in from a local company that tailor makes the exhaust :) This is a 2.5" custom Ferrita exhaust system with a Ferrita race cat. The Ferrita race cat burn`s longer and more sufficant than the stock one and decreases the co2 without loosing momentum or power. Also the db leve was taking care of. And now it running under 88db 3500rpm. "Running silent, running deep"