Turbo diesel engines

I don't have any specific knowledge of the chips you refer to, but there has long been companies offering chips that do everything including re-growing your hair and improving your sex life. I'm sceptical about them. While they might well improve the performance/economy you need to know how they do it so you can assess the potential downsides. Those downsides are often a loss of reliability and a reduction in engine life. It's best to talk to someone who has fitted the same chip and get an independent opinion from him or her.