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Exhaust tuning can achieve specific characteristics. You can choke the engine out a bit at the higher RPMs, and get desirable lower RPM characteristics which will change your VE and BSFC maps, meaning that you'll have to change other things to fully take advantage of it.
It's not "killing performance to get better fuel economy", it's tuning for a specific characteristic.
You'll have to do some serious studying to determine the proper exhaust length/diameter configuration for the characteristics you're trying to achieve.
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