I too would like a little more sound from my ST. After finding what I could on here and youtube, I purchased the MRT H-pipe. It is scheduled to arrive tomorrow, and will hopefully be installed on Saturday. From what I have read I am expecting a slight increase in volume both inside and outside of the vehicle, and no drone. With the sale they are having I was able to get it shipped for $246, which seems to be a steal compared to some other exhaust mods/upgrades. Just thought I'd mention it.