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Also was wondering if a tune may help this issue by increasing the amount of fuel at lower rpms. Stock the afr is 14.7 at wot until almost 5k rpm then it tapers to 12.6 by redline. That seems a bit lean to me at least in the lower rpm. Looks like some of the tuned stuff runs a bit richer down low. Maybe that will help cool the combustion and drown out some of the pre ignition. I may try the stage one tune and do some logs to see how it reacts.
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