The two production engines were always mated to an automatic gearbox but have become popular in the custom car scene where they have been mated to the 4x4 manual transmission and the rear-wheel-drive manual transmission from the Ford Sierra XR4 and XR4x4. There are also companies that offer twin and single turbo conversions, and other modifications to increase power to usually around . These engines can be bought relatively cheaply and, providing they are well serviced, engines have been known to cover over 200,000 miles without major work being required.