I just put four TurboGas in my 90q20v. Overall, nice shocks. Good control but not at all stiff. Like new shocks with a few percent more damping. According to the deaer who sold them (they also sell Bilstein and Koni) their failure/return rate is lowest with BOGE pro/Turbo gas. On my previous 4000q, the BOGE Turbo TS (hydraulic) lasted 100k+, gradually gettign softer, but no failures. Grant