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1991 964 Performance upgrades

Engine

Vehicle Information: Year: 1991; Body Type: Coupe; Engine (type, size, modifications): ventilation system for the 2nd distributor belt; Total Mileage: 52000;

I drive my C4 every day plus occasion autocross and am considering club racing. Questions regarding upgrade/replacements:1- From the previous forums, etc, it seems that the best performance upgrade for the money is air intake and the test pipe combination. What is the difference between the K&N cone filter, test pipe, and performance chip offered by Vertex and the 911 Mass Flow Sensor and Software Package offered by Performance Parts?2- Also, my car (Dec 4, 1991), was equipped with a DuoMass flywheel. Since I need to replace/upgrade my clutch, what are the recommendations for clutch and flywheel upgrades?3- In replacing/upgrading the shocks, is it necessary/desirable to go to a combined strut, lowered spring and shock upgrade or simply go to Koni (or equivalent) adjustable shocks?4- Is there anywhere/anyone who has any of the upgrades as staged kits/packages?

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