 All engines were catalysed and were fitted with a drive-by-wire throttle setup that was criticised as dangerous, and adjustable air suspension was available as an optional extra on long-wheelbase diesel models.A factory LPG conversion (using an underfloor LPG tank and a rear-mounted petrol tank) was also available using a converted Ford eight-valve petrol engine with a peak power output of 115PS.This conversion was popular with police due to the high power output without the running costs of the V8 (explained below).