Hi, I don't have an SX, but the first series of CJ ES (2007).
I was not enamoured with the exhaust note, hence me changing it. I built a new axle-back (final) exhaust to give it a deeper grumble.
The SX is a tidy car, are you getting a manual or a CVT auto?
I bought mine at the Govt. Auctions, so only autos were on offer. I have since spent $12K+ doing it up from base level to something nice, to my liking.
Out of all the mid-sized cars, the Lancer CJ has a good amount of torque and horsepower, that rivals the Holden Cruze, Ford Focus, Hyundai i30, Honda Civic etc... so although you might not have the 2.4ltr VRX, you will still be very happy with the power.
There are a lot of mods that are available now, so just pick the ones you like and customise!
My before and after:
Ryan and Dave are also a wealth of knowledge on here, regarding CJs, as I am sure are others.
P.S. I have an aftermarket single exhaust system sitting around (now that I bought a stainless twin) should you want a bolt-on, extremely inexpensive one to tie you over!!