Magnaflow over Flowmasters any day.
I have Borlas on my '37 Ford... they're TOO quiet...
Use an "X" pipe... and run 'em out the back... that really helps over dumping under the car.
A lot of that also has to do with gear choice... a few hundred rpm difference makes a BIG difference in noise. I like to keep 'em down under 2000 rpms at 65ish. You get up to 24/2500 at that speed and it gets way more exhaust drone.
Think about a new Corvette... they're cruising at 14/1500 rpms at 70.... and almost whisper... get on 'em with the cut outs and they sound nasty.
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