18th Jan 06 When fitted and set to “1” the CRD tuning box gives a marked improvement in performance. Acceleration is smooth and available at all revs. The box took 5 minutes to fit and was easily adjusted. This is the third time I have added a tuning box device to a diesel car and previously I have paid nearly twice as much to get the same power increase. Diesel Tuning UK have been very supportive throughout the sales process and assisted me in adjusting the tuning box to suit my needs. This is an excellent product and well worth the money. Regards Andrew