Hello dear, in the forum a lot was written about tuning, such as in this thread of ollo95. What I could not find were detailed reports from people who drive a HIRSCH. I got in touch with the Swiss and know that there are the following 2 tuning levels for the 9-5 2.3T (series 220PS/310NM) and the 9-5 Aero (series 250PS/350NM):Step1 280 PS/400 Nm includes a complete intake system, larger charge air cooler, exhaust system from catalyst, adapted softwar e.Step2 305 hp / 420 Nm (automaton 400 Nm) like Step1, in addition with sport catalyst, larger turbocharger and modified petrol pressure regulator. At Step2 the sports suspension and the 4-piston brake must be mounted. I am interested in “reports” from the HIRSCHen about reliable conduction, durability, satisfaction, consumption and wear (tires, clutch etc. …) Those who have pleasure and experience should reach for the spring (or better to the keyboard). Thank you & Greetings Keule69