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Exhaust work should be one of the first things to modify on any stock vehicle for more power and economy. We added a Flowmaster after-cat system using an 80-series cross-flow muffler and mandrel-bent tubing that duplicates the single-exhaust system. We elected to retain the replacement 2-1/2-inch cat even though we used the larger 3-inch Flowmaster   system.
My Generation Camaro, Part I - 1987 Chevy Camaro 305ci

Exhaust work should be one of the first things to modify on any stock vehicle for more power and economy. We added a Flowmaster after-cat system using an 80-series cross-flow muffler and mandrel-bent tubing that duplicates the single-exhaust system. We elected to retain the replacement 2-1/2-inch cat even though we used the larger 3-inch Flowmaster system.  View Related Article

 

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