I've had a flowmaster and a magnaflow on my first camaro which was a 3.4L. Flowmaster def had a better sound at idle, but i liked the sound on my magnaflow muffler when running at higher rpms. The only thing I noticed was flowmaster was loud all through the rpms, and magnaflow wasnt as loud in the higher rpms. flowmaster sounded best at around 3500-4000rpm, and magnaflow sounded good at like 2500-3200rpm. I didnt like the flowmaster also becuase at higher rpms, it sounded like a damn rice burner! But my Camaro didnt have a res. so it might be a little different sound than my Camaro did.
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