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Weight, Undersized pulley, free-er flowing exhaust will help. The under-drive pulley being an immediate HP pickup. We eliminated the 2nd set of cats on your car along with the original muffler. A LOT of unexpected weight lost there!!
An upgrade to a bigger engine is always possible but spendy :-)
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Jon
1966 912, 1976 911
1986 944, 2000 Boxster
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