I may be trading my friend a JL Audio 12w3 for his Progress rear sway bar (part #61.1004/62.1003)

I have an 00 Si, so i'm pretty sure i already have an OEM rear. Is this mod worth the trouble? Would there be much of a difference? Thanks!

 

a rear sway bar, or a bigger one in your case will make the most difference in the way car handles. Progress makes good stuff and although i do not have their ARBs i do have their springs. ARBs should be the first replacement/add-on to any suspension alteration. keep in mind your car will rotate much more with a bigger rear bar, so be prepared for that. make sure your tires are in good shape as well. loosing your tail in a turn when you had never could before is unsettling.
Stan

 

So i should upgrade my Si sway bar, to the progress?

 

if you're into cornering... then, yes, upgrade......... to the progress? i dunno........