Finally got around to installing the GMG headers and center muffler section on the GT3RS. Overall differences in weights were minimal. The OE headers/cats were sighly lighter than the GMG headers and the GMG center section was lighter than the OE center section slightly.  The sound at idle is slightly louder, but very civil.  The sound at 4500rpms when the valves open on the stock mufflers, is incredible!  Getting started:  We also have a set of quad laser intercepters to …

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