Cheap HP
I'm interested on ideas to gain a few extra HP without investing a small fortune (Ideally proven on a dyno or such). I have a 1971 911 S, 2.2, with approx 180hp. It's stock except for a K&N air filter and some nice plug leads. I drive it mostly at DE events....Seems it's already fairly well tuned from the factory but can I get more ??
Thanks for your ideas !
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