QuickFast

I know that this may sound a lot like a noob question, but i had to get it out of my mind. I've been doing a lot of research on exhaust systems and I don't want my exhaust to be too loud. Im starting to like the powertech mufflers because i heard that they have a nice low deep tone and i was wondering if i could buy the SP2 system but switch the SP2 muffler with the powertech one. Is it possible? Will the sound change? Is it easy to do?