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1976 911S Heat Exchanger and Muffler Upgrade

Engine

Vehicle Information: Model: 911S; Year: 1976; Body Type: Coupe; Total Mileage: 110,000 (1000 on rebuild);

With the engine rebuild, I also converted to pre-74 equal length SSI heatexchangers and a Dansk SS muffler. I am still in the break-in period anddo notice improved response in mid-range 3-5K RPMs. My mechanic says I'llnotice better performance but will not commit to actual HP and torquegains. I presume there must be firm data somewhere that documents thesegains. Please tell me what they are. Also, will changing the fan andpulley yield any gain at all? I will say the car sounds better than everand I can hardly wait until I can use the full range in driving.

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