That is how Piet Vonk from Delft/NL calls the RENNKOMPRESSOR. He needs to know what he is talking about, not just because he is driving a Porsche but because he sees many pumps coming and going. »Porsche is the car manufacturer with the most cars that are still driving since new purchase. And it is the same with the RENNKOMPRESSOR«, explains Piet Vonk his absolutely comprehensible comparison.