"X2" means that he agrees with the above statement..."times 2"
I would look into the resonator delete set-up that most are running on here, if you want more sound after that I'd recommend getting just the muffler from the manufacturer of your choice and replace the stock boat anchor, quarter of the price for the same results.
For a more beefy look you can go with a leveling kit and larger tires or if you want to maintain near factory height I look at up sizing your tires, if you have 20's I'd look into some 305/50/20 or 285/55/20's for a better look.