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What is the safe maximum boost that can be used on a TH tuned for 93 octane fuel? I seek boost information from TH owners whose TH's have been tuned with 93 octane. I am contemplating using the new Hellraiser clutched pulley which achieves a maximum boost of around 16 lbs. Also, it is my understanding that at 16 lbs of boost on 93 octane fuel, timing would need to be pulled. Not sure why though. Any help in answering these questions would be appreciated and informative to readers. Thanks