I have an '09 96" HD Road Glide. Its stock except for a K&N high flow breather and a 2-1 Thunderheader. This winter I will be installing a 2-1 Supermegs. I've read that 16 disks with a closed cap will flow approx. 210 CFM. My question is, does anyone know what the CFM numbers are for a Thunderheader? I'm just curious, I'm sure my bike will run better with the SuperTrapp as it most likely will produce more back pressure.