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  1. J

    4 mufflers exhaust on 3" pipes

    I have a 540 hp 440 with 1 7/8" headers, 3" collector, H pipe, 3" Flowmaster 50 series and tailpipes. It is very loud; too loud. I want to be about as loud as a stock type muscle car would be, but not whisper quite like a Corvette. I do not believe that the 70 series Big Block II Flowmaster...
  3. J

    Flowmaster 70 Series Big Block II mufflers

    Is anyone using Flowmaster 70 Series Big Block II mufflers on a small block making at least 400 hp or a big block making at least 500 hp with with headers and large exhaust pipes? If so, can you compare the loudness to the 50 Series Delta Flow mufflers, which I currently have and think are a...
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