Kernow Posted September 10, 2016 Author Share Posted September 10, 2016 Ok so a 1000 mile + update... Sound has stopped changing and I assume it is lovely and carboned up inside. Although it sounds wicked, unfortunately it has definitely got a pretty annoying drone from 2000 to about 2600 revs which is a shame because this is the sole reason I got the resonated over the non resonated.... God knows how bad the drone is from the non resonated! As a daily driver this is a bit much but perhaps can be improved by some sound proofing in the boot and bulkhead? If anyone has any idea how to decrease drone other than avoiding that Rev range completely then I am all ears. Cheers guys Quote Link to comment Share on other sites More sharing options...
monkeybrain1234 Posted September 12, 2016 Share Posted September 12, 2016 I think you will find most aftermarket Exhaust will suffer drone at some part of the rev range. Personally I would adapt your driving style to punch through this part of the rev range rather than throwing money at trying to reduce the drone. Quote Link to comment Share on other sites More sharing options...
Randy_Baton Posted September 12, 2016 Share Posted September 12, 2016 I soundproofed my boot with Dynamat and put a rubber carpet underlay and a foam carpet underlay in my boot. Didn't really notice much of a difference. I have had a cobra resonated set up on teh car from when I brought it (not sure how old it is). I've just put a new Cobra back box on and the noise is greatly reduced but its only ~50 miles in. My old back box would drone 2500-3500 which is pretty hard to push through unless you want to hoon all the time. One thing I've always wondered is if changing the cats and the Y pipe from OEM would make any difference to the cobra drone. Quote Link to comment Share on other sites More sharing options...
Kernow Posted September 12, 2016 Author Share Posted September 12, 2016 I think you will find most aftermarket Exhaust will suffer drone at some part of the rev range. Personally I would adapt your driving style to punch through this part of the rev range rather than throwing money at trying to reduce the drone. Yeah I think this has to be the way forward for now Quote Link to comment Share on other sites More sharing options...
Kernow Posted September 12, 2016 Author Share Posted September 12, 2016 I soundproofed my boot with Dynamat and put a rubber carpet underlay and a foam carpet underlay in my boot. Didn't really notice much of a difference. I have had a cobra resonated set up on teh car from when I brought it (not sure how old it is). I've just put a new Cobra back box on and the noise is greatly reduced but its only ~50 miles in. My old back box would drone 2500-3500 which is pretty hard to push through unless you want to hoon all the time. One thing I've always wondered is if changing the cats and the Y pipe from OEM would make any difference to the cobra drone. Good to know the soundproofing hasn't made much difference, saved me a job. I can only imagine changing the cats and Y-pipe would make the drone louder. What actually causes drone anyway? Is it just the resonance in the cabin or does it sound droney outside too? Quote Link to comment Share on other sites More sharing options...
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