DD, yes I do.....
I think you can move the y-pipe down the list though, as I feel it is more of a stage 3 mod.
The sway bar is a good investment......
Most of the performance from a 4.0 is by proper tuning and more air flow....
Also keep in mind that you will need a new tune for the C&L and the y-pipe. You do not need one for my throttle body, ( it is recommended if you feel you want to). Then you can get 1 tune for 2 items you add on, unless the tuner is giving you free upgrades....
hope this helps
Todd Z