heres a cheat for you, if your car has an air pump. do a quick wiring job to make the air pump run while going through inspection. It will pump air into the exhaust giving you 0 emissions.

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99 Jetta Mk3
07 Jetta Mk5
89 300E W124
10 E 350 W212
08 C300 W204
Benz's aren't mine