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I just got a new suspension for my 02. What do you guys think about a rear upper and lower strut bars. Does it make that much of a difference?

 
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they are actually quite worth the money, i would get them. if you want a cheaper sway bar then go with rsx 19mm rear sway bar; however, if you have some extra cash, go with neuspeed 23mm, although 19mm is plenty for everyday driving seeing it sells for about 35 dollars.

 
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I have Front Upper strut, Tanabe sustec front lower brace, Progress front sway(27mm), Progress rear sway(22mm), Progress Rear lower tie, dropped on tein s techs soon to be on D2's,

I'd say fronts make a big difference, you really don't feel it daily driving though, rear upper will make only a lil difference with the double wishbone.

There are a tons of posts about this. Hope this helps.