The DVLA defines radically altered vehicles as “Radically altered vehicles are vehicles that have been altered from their original specification, but are not kit conversions.” The DVLA consider a vehicle to fall under the ”Rebuilt” vehicle class if the original unmodified chassis or monocoque is retained and keeps at least two of the following elements as standard: suspension, steering assembly, axles, transmission and engine.

The repower does not require modification of the monocoque (if a Booster is build as per the manual then the chassis remains entirely as original with no additional holes drilled or parts welded) and only the engine is replaced, it retains an unmodified monocoque, suspension, steering assemble, axles and transmission.

DVLA notification is required for the change in engine capacity only. Emissions type approval falls under pre March 2001 regulations where the vehicle must meet the original emissions system performance but does not require type approved emissions system components as it would not have been type approved originally prior to this date. Using a single metalic catalyst in the exhaust allows a Booster to meet the required emissions standards.