So you had the same experience too...right around like 25-30 mph was just a really loud drone and in the twisties you often stay around that speed. Might try to snap up a MBRP or SPI but also don't want to spend $4-500 and be pissed again.
I"m in the same vote. I hate the suitcase in there now. I don't like the idea of not being able to check my chain case adjustment. The space difference between the factory and aftermarket is huge, it has to help with the heat build up under there. And of course the weight savings helps. But I.m not wasting my money again.