5inn
Senior Member
Looking at the rates, from the progress link above (https://progressauto.com/products/sfID1/12/sfID2/34/sfID3/90/productID/864) and the rates from Karcepts (http://www.karcepts.com/shop/product.php?id_product=131), the 'big' progress bar (22.2mm) is not much stiffer than the CTR bar. Progress = 740 lbs/in. Stock CTR = 721 lbs/in. Stock Si = 457 lbs/in.Progress confirmed with me that the 22mm rear bar I posted above will fit an Si. So that's the route I'm going as soon as my car arrives.
That's cool. You'll still be able to get some coin for it as long it's not too beat up. Good luck!
The Eibach one seems to be available in 25mm but not sure what that breaks down to in lbs/in. https://www.procivic.com/p/ym/2017/civic/eibach-sway-bar-kit.html It mentions only fitting CTR, but it seems pretty clear if it fits one, it will fit the other.
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