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The extra machine work costs around $3-400 (US) if you're having the heads done anyway. You will need to change your ignition advance (reprogram chip) and get a "splitter" box for the ignition ($5-600 US for the Andial one or make your own).
-Chris
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'80 911 Nogaro blue Phoenix!
'07 BMW 328i 245K miles!
http://members.rennlist.org/messinwith911s/
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