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Modify Airbox

Engine

Vehicle Information: Year: 1992; Body Type: Cabriolet; Total Mileage: 75000;

Hello again. I am planing to make my 964 to sound a little better by drilling holes in the original airbox cover and will be using K&N filter. Will there be any smog inspection problem with drilled out airbox cover? Also I have just learned that there are some Porsches will have massair flow problems after changed and used K&N filter; will my 1992 (964) have this same problem. Thank you in advance.

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