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Not me. I looked at them and wondered what the spool-up and boost was like. The smaller the turbine scroll, the faster and sooner the turbo comes in. Compare a whistler and non-whistler turbo and you'll see that the whistler looks real undersized for the size of the engine. Might not be that big...

True, the two go hand in hand. Although I might exchange "fuel economy" for "fuel efficiency". The more air--the more thorough the combustion; the more fuel per charge burned--the more power or alternately, the less fuel needed to maintain a given power level as generated by a less efficient...

Simple fact of life... "whistler" turbos build power; non-whistlers clean up emissions. That's the way they were designed and applied.