honestly I went from completely stock to both springs and sway bar. I have no experience with the ultra racing ones or the TRD one so I can't say how it compares but body roll is next to nothing. a friend of mine who autocrosses drove it and said it was nice.
honestly for the difference in price, I went ahead and got the one that was adjustable even though it was about $20 more. the installation was easy. I did it without even jacking the car up.
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