After driving my 240D for two years, from new, I installed a Garrett turbo kit. A lot of work and kind of pricy but well worth it all. The car will keep up with the traffic, all the traffic and I don't have to shift down at every mountain hill I come to. No smoke at any throttle and early boost, not like my 300D turbo that is kind of slow to give it to me. The control system is very simple, an easly adjusted waste gate that also acts as an over boost control. I push 12" to get 40% more power and the engine is in mint condition after probably a half million kliks. I drive this car all the time and my wife drives the 300D turbo. From a stand still I can take her every time.