2.5 complete exhaust VS a 3.0 complete exhaust

When I put in my X pipe, I also ran full length pipes to the bumper at the same time. When I did all of this, I could tell a huge difference in the power output. Since I added two items at the same time, I cant really pinpoint what made the car feel better-the X or the complete exhaust system. One thing I will say is true about an X, is that id made the exhaust note quieter, and somewhat muffled, just like what was said above that the note was not as crisp. I like the way it changed the tone though, it really helps with the "sleeper" vibe of my car cause its fairly quiet.