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I was running 89 AKI (US) gas in my car since I got my 340 mppsk 6 months ago, and I just started using 93 AKI recently.
I've noticed the mppsk driveby shooting sounds feel completely muted/dampened with a higher octane. Every post I've read here says both the engine and mppsk perform/sound better with higher octane fuel. So I'm wondering if my ECU has to get "used" to a new octane before the exhaust comes alive again?
Or perhaps I just bought a bad batch of gas regardless of its higher AKI rating?
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