I called a couple places yesterday about Eibach Pro-Kit springs for the tC. They are on average about $220+ (cheapest I found for preorder was 220) and they are to be released on Dec. 24th, Im not sure when the dealers/stores will have them but thats when they are comin out. They are progressive rate with, I remember seeing it somewhere but cant find it now :? around 25% stiffer in the front and 32ish% in the rear but Im not 100% on that, but it does lower it 1.2 front and 1.0 rear.

Just sharing some info that some of you might want, these are the springs I'm gettin and I'll post how it rides once I get em installed.

In the past, TRD springs were rebadged Eibach Pro-kits. I guess it changed for the tC?

Well the Eibachs are progressive rate... so its like a stock ride on straight roads (good) but its stiffer than TRD's in corners, and the TRD's are linear I believe. If anyone has any better sources for info on these I'd love to know more...