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Just want to give you guys an update.
I am now using Shell 91 with boostane professional (1 can). It works really well, IAM is at 1 and no more knock on my supercharged BRZ.
For some odd reason, it is actually better than Chevron 94 + Boostane (per datalog). Chevron 94 has a few small correction. No idea why.
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