The only (and very good) benefit you'll get is more accessibility to engine compartment. I've installed a cone filter on my 84. No gain in perf. but gain in accessibility and look.
http://shop.ebay.com/?_from=R40&_trksid=p3907.m38.l1313&_nkw=porsche+911+air+filter+adapter&_sacat=See-All-Categories
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1984 911 CARRERA RUBY RED TARGA
SW CHIPPED-BURSCH CATBYPASS
MONTY FREE FLOW EXHAUST
<IN GAS WE TRUST>
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