That has to be a complete rip-off. Modern fuel-injected cars just do not build up carbon. And even if they did, the accepted way of cleaning out carbon from a high-performance car is an Italian tune up, where you drive the car at over 100 miles an hour at red line for half an hour to clean everything up.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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