i need to get my car tested this month and i was thinking of leaning it out a bit, just for the test. under what conditions would this help me pass? the car really just needs a new exhaust system because i think the cat has gone bad, however i dont have the $1k to drop on a new exhaust from timevalve.

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Jonathan
1998 S600
2001 E430
1994 E320
1991 560SEL
1994 Turbo R