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CSDMagred01
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My guess: If you lower the air restriction (halltec) the engine breathes better (more air) and same amount of gas the engine runs leaner (like his mechanic said), hence higher temps and pinging. This is especially true during any transition to acceleration when the lower restriction allows the air flow to change faster then the MAF is programmed to respond. Since the MAF is input to the fuel mapping, the gas doesn't ramp up as fast as the air. Lean condition. Better gas would give you a broader operating window to not have pinging happen at the leaner mixture.