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Performance Modifications

Model: 928S4, Year:1987, Mileage:117000, Type of use:Street use only
I have been asking several questions lately pertaining to wheels and tires for my 928. Now I would be grateful if someone could help me through the process of adding some additional HP without breaking the bank.Are performance chips worth a damn. And if so what type?Would you do any exhaust modifications, if so what might you suggest?Are there any light to moderate engine modifications that will not deplete the engines life? Any help with these issues would be greatly appreciated.Thank You in advance

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