Originally Posted by Khoi@AAMComp

unfortunately that's a battle we probably won't be able to win with
short tail owners, looking for more power, but quieting the exhaust. Now a possible goal would be to make it "just" as loud, but I'm almost positive opening up the exhaust no matter how resonated it is, will be louder. Again because with the short tails you've lost your only source of sound deadning. Inline mufflers in the midpipe may help with volume, but resonators no matter how long they are will not bring the volume down to balance off the added volume with the bigger piping.

adding HFC's will add volume for sure and some power gains. If you don't have a CAI already, I would suggest that to squeeze a few hp's out.