A popcorn limiter changes the way a diesel car behaves when the engine hits the rpm limiter. Most stock diesel vehicles will hit the pre-set rpm limiter and will stay at that exact rpm point until the driver intervenes (soft cut limiter). However, with a popcorn limiter applied the engine will bounce at the limiter in a similar way to a petrol vehicle (hard cut limiter).

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The popcorn limiter has no performance advantage, it is simply a feature that can be enabled during the remap in order to change how the engine behaves and sounds when the rpm limiter is reached.