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Your Zeniths can be retuned to work with it. You don't have to do anything to the heads, but if you have them ported out to S spec you will get more horsepower from the build. You can leave them if it's not in the budget.
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1974 914 Bumble Bee
2009 Outback XT
2008 Cayman S shop test Mule
1996 WRX V-limited 450/1000
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