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996 Engine modifications

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Vehicle Information: Year: 2003; Body Type: Coupe; Total Mileage: 5000;

I am in the process of modifying my intake/exhaust system for my 2003 996. I use it mostly for street use. The equipment I have been looking at is:1) Fabspeed Maxflo Muffler and Tips2) Fabspeed cold airbox including internal airbox changes (i.e. elimination of airbox muffler and removal of mass air sensor grill) vs. Carrera cup style airbox.3) BMC vs. K&N air filter.My questions are regarding the effect on:1) Horsepower gains.2) Driveability.3) Warranty.Are there any other suppliers you would recommend?

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