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Crusty Conservative
Join Date: Apr 1999
Location: Friendswood, TX, America
Posts: 3,243
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I agree with rswannabe.
My experience is that the 10 to 15 hp increase is optimistic at best on an early engine that already has free flowing heat exchangers. The data may have become somewhat muddled over the years as mid year cars were backdated and a sport muffler was attached... 
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Bill
69 911 T Targa, 2.4E w/carbs (1985-2001)
70 911 S Coupe, 2nd owner (1989- 2015)
73 911 T Targa, 3.2 Motronic (2001- )
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