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So i just installed a set of Top Speed test pipes, and i noticed that around in between 3-4k rpms, it gets really raspy. Is this normal, or could i potentially have an exhaust leak?
 

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The raspiness is normal for straight test pipes. I have the Helix pipes, but they don't sound bad when idling or just normal cruising.
 

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with just test pipes it will still be raspy... you will need some sort of resonator on them to keep that down... no way to avoid it.
 
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