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In addition you can retain heat (at least enough for GA) and remove that giant black electric blower fan. You would then replace it with ducting known as a "cup heater pipe" . Heated air will still be moved through the heat exchangers into the car by the primary fan (the main belt driven one). The electrical secondary is just a "booster fan".
Originally Porsche made this item out of a black plastic. Now you can find some trick Carbon fiber bits ranging from $200-$400. I believe I picked mine up from Maxspeed Motorsports (a Canadian based distributer, pretty sure CF-Part came out of China) for around $200 and its nice.
As far as exhaust, I have and '89 C4; Contrary to most of the current and old cars, they don't even put mine on the dino or plug it into a computer...they check the gas cap and use their "sniffer" at idle by the exhaust and send it on the way... You could really shave some weight by simplifying the number of mufflers (stock has a primary and secondary. You could also make a lot more power by letting it breath better. I understand the exhaust on the 964 to be very restrictive...
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