i have a corsa sport on the RST and have no drone, however i know corsa also make the Race DB series which are MUCH louder, much smaller, and will have more resonance in the cab. i HIGHLY doubt you will find enough room to mount 2 of the large corsa sport mufflers, so if you go with the DB race series i would still expect some drone but i do not know for sure. just for the records corsa makes A+++++ products and is the ONLY muffler i will ever own from now on. just my 2 cents.