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Save your money. Do a search on the subject. Some of the threads can be brutal. The stock system can handle and adjust to small changes in airflow such as a muffler. Unless you change the entire airflow through the engine there is little i.e. Nothing to gain from a tune. Porsche engineers left nothing on the table and designed a total hi perf/racing system with max spark advance curves (why Premium fuel is required).
Invest instead in some high performance driving instruction, until you can wring every ounce of performance out of the car!
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