hi there,
yes, there would be some side effects (u won't like it);
the rear brace could easily break off/tear.
I would suggest that you re-inforce your rear brace before attempting to fit the DC2R anti roll bar.
i would suggest the rear brace that sasuke is selling. i've personally used it (even though i did buy it from sasuke) and it works fine.
http://www.zerotohundred.com/newfor...bframe-reinforcement-brace-for-ek-eg-dc2.html
the rear end of your car will feel stiffer thus you should be care fully when attacking corners. it won't pose a problem if you have a hatch though as taking corners in a hatch requires a different technique. do ensure that you have a stiff suspension set up as well.
ASR rocks!