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Could you elaborate on option 1 - SSI w/ DIY heater sysem?
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When I had a 964 engine in my Carrera I used the pictured setup for a while. It works ok for a street car but is too restrictive at high rpm for max. performance.
To hook up heat all you need is to modify the 964 heat tube just after it drops below the tin work as pictured here
just use ~2.5" hole saw to drill a hole in the side of the stock tube, size the hole so that the duct fits snuggly in the hole, run this duct to the left side ssi heat inlet. I used a silicon sleeve, from the stock 964 heat, to clamp in place on the ssi.
The reducer at the bottom is a std. aluminum dryer vent piece which connects to some ss or galvanized 2.5" flex tube.
The flex tube crosse to the other side where the final 180° bend is again made w/ more flexible duct, claped on w/ the silicoon sleeve.
it was a while ago so take the posted sizes w/ a grain of salt.
Worked great.