Yes they can be replaced with the motor in the car but I wouldn't worry about a few plastic bits in the filter. Its normal. I get it all the time. Just check the cam deviation. When its gets above 6 then its time to do the variocam ramps.
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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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