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D. Vizard did extensive exh system testing. As far as crossovers, he stated that he never found a case where the engine lost hp, but in some cases, it did not gain hp.

Unfortunately, sound is a subjective thing. What is music to some [ like [c]Rap 'music' ] is objectionable to others.....

Flowmasters are misnamed, should be FlowLess. No place on a car. Unfortunately, no easy fix for drone/resonance. H or X pipe might cause resonance on some cars, others it doesn't. It doesn't on my car..... Every car is different & once the engine is no longer stock, you change how it behaves...