Hey mate. I drive/own a 09 SV6 and i have a full xforce 2.25 system. Extractors and highlow cats. And im extreamly happy with the sound. If i do it again, ill go 2.5 as for my personall liking, its not loud enough but stil really loud. Yes it does drone, if urs manuel then ull have less drone and if u keep the car on abit high revs itll be fine.
You will never get it to sound like a 8 man sorry but yeah. SSV muflers are a cheap way of getting ur car to sound. but u wont have any preformance increase. If ur not really into preformance increase and just want an exhaust just take the mufflers off and drive it up and down ur street and see if you like it. But no that without mufflers it sounds like a wet fart, way to loud and drones like a bitch. but itll give u an idea of what it is.
Also i felt huge difference in power.
Enjoy buddy