Induction sound is not exhaust sound, reminds me of back in the day we'd flip the air filter cover over on 70s Chevys and call it "Polish Headers" because of the sound when WOT. Probably slowed the car down sucking in the hot underhood air, more than helping with additional airflow. Now "Cold Air" kits to me remind me of that, some are actually HOT AIR kits, and don't get fresh outside air any better, or worse then factory setups, but they sound better.