Originally Posted by foreigneRS
it won't have a throttle linkage - it'll just have a pot on the pedal and be throttle by wire (although being a diesel it won't actually have a throttle at all
)
as chip says, restrict airflow into turbo or reduce boost is best way - anything that restricts exhaust is very bad for the engine in terms of heat build up
You could still restrict the pedal movement, which has to be the simplest way.