I'm curious to know, how many diffusers, per muffler (Fatshots), would you need to equal the Rienharts I am replacing. Would it be 12, 10, 8, I would like to have a starting point. I tried with 12 per side, wicked at 3000 rpm's and up but the bottom end torque is gone. Love the mufflers however, after several different makes, these are the best for sound, appearance and quality. Thank you.