Actually, they sound really good even with the test pipes. There is absolutely NO rasp whatsover. There might be a little drone, but I'm comaring to what my Evo IX with full 3 inch exhaust from the manifold sounded like. This is much more refined. Granted, when you are on throttle and there is more than a little load on the engine, it sounds aggressive, but as for drone I really can't say it has much if any.
Driving 65-75 miles per hour on the highway is VERY comfortable. I was surprised...
Hope that helps,
Tony
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2009 BS 6MT Touring - Berk Test Pipes, Invidia Gemini Exhaust
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