The X crossover both quieted and very slightly increased seat of the pants accelleration on a friends 70' GTO (400 ci, 280 cfm d-ports, 248 duration 580 lift solid cam, 1 3/4 headers, 3" exhaust out the back, Super Turbos)The sound is definently different... less rumbly??? Like an old gas dragster with the short pipes comming off each exhaust port, much quieter of course.
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