I put this on a an 1.6 90hp VW/Audi diesel engine. GOT alot of more torque and its like a new car. It added the little extra. I was sceptical. But devisen to try it. Read the manual and follow the steps this is hos you avoid warning lights. It has to be setup like the manual says. I har 40 000+km on the box still noe issues, black smoke or start/idle trouble. Its cheaper Than oljer companies and does the same job.