I had a complete 2.5" magnaflow exhaust system on my 67 Chevelle 'vert with a stock LQ9 (hi-po truck LS). It was too loud and droned obnoxiously between 1500 and 2500 RPM. I replaced the Magnaflow mufflers with DynoMax Super Turbos - much quieter and the drone is almost gone. Hard to exaggerate the difference.
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