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Recently drove a completely stock 60k mile 1987 911 and a coned, chipped, dual outlet exhaust and who all knows what else 80K 1987 911. Not really a fair comparison without testing leakdown or knowing condition or correct plugs plus valve clearance, but back to back the stock one was noticeably quicker down low, in mid-range and top end pull.
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Jeff
74 911, #3
I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible.
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