Exactly -- Ford has doubtlessly spent a ton of money and time optimizing the entire systems for best performance and economy. And even if -- IF -- you got a little MPG boost from an aftermarket exhaust, it would probably take 250,000 miles of driving to recoup the cost of buying and installing it.Ford no doubt has engineered in the exact exhaust back pressure to maximize torque in the proper rpm range. I would leave it alone especially since the engine is in harmony with the electric motor. Much less going from Ferrari rap to silence during mode change, leaving people scratching their head.
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