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If a muffler is prone to drone, it will be in one specific small RPM range. Unfortunately, the RPM range is usually right at cruising speed in the top gear. And the drone is so obnoxious that you wind up cruising at a slightly different speed than you normally would (either higher or lower) just to avoid the drone. Corsas and Borlas both make high quality mufflers that do not drone in most applications. The Corsas generally cost more than the equivalent model Borlas.
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