When I had my 94 and wanted to change exhausts, at the time, everyone complained about the drone associated with the Borla systems. So I went with Corsa. I loved the sound of the Corsa exhaust. A friend here on the forum had Borla on his C5Z and it sounded awesome. I followed him from Kansas City to Bowling Green, so I got to hear it.... a lot. :L When I moved to the C5 I didn't consider anything else but Corsa. As I recall, my friend did talk about the drone. I loved the Corsa on my C5. When I purchased my C6 it had the Borla Stinger axle back on it. I immediately started thinking I would sell it and install a Corsa, because I figured it would drone. To my surprise, it doesn't have much drone, and at highway speeds it sounds very docile, inside the car.
If it has drone, I don't notice it, and my wife hasn't complained (about the drone anyway
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Now the questions are; Has Borla changed the design to eliminate the drone? Did they change the C4 and C5 systems? Is this an inherent thing for C4s and 5s? I cannot answer those questions, all I know is that the drone with the Borla system on my C6 is controllable. Or should I say tolerable? The biggest difference between my C4 and C5 as to my C6 is the transmissions. C4 and C5 were automatic trans. The C6 is manual and I can control the RPMS. If I begin to hear (really feel) a drone starting, I just shift to another gear and change RPM range. With the auto trans I didn't have that kind of control.
By the way, I'm sticking with my Borla, I love the deep throaty sound as compared to the higher pitch of the Corsa.