General Powerflow Exhaust

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General Powerflow Exhaust

Got my new midsection fitted (nothing fancy, same as OEM spec). However, it's quieter than the leaky exhaust until i go through 2000 and 4000 RPM where it gets much louder than my old leaky exhaust. Is this normal? OR have the garage not sealed it properly and the vibrations are making it noisier?
 
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