I am going to be doing springs on both cars, probably ordered them today for a combo discount. (No, not doing coil overs at this time as I do not track either car, or drive either hard enough to get that aggressive with the suspension.) So, over the years for my personal cars, I have only used Eibach and H&R. But now going full into the Japanese side of the auto word, (taking a German breather) there is a whole new world of aftermarket brands I don't have as much hands on driving or owning experience. In this case, price is not a deciding factor, as all four options are with in $20 of each other. Also, ride height differences are with-in 0.4" total of each other, so that is not a factor either. For both cars, including the two brands I am familiar with, I am looking at TEIN and Tannabe too. I have read quite positive reviews from real users on all of them. The Eibach is my safe bet from a comfort zone POV, the Tannabe has some nice traits, but the TEIN seems to be a front runner with reportedly better material (Chrome Vanadium) which also results in less weight. Of the real performance car guys on here, what are the experiences with TEIN and Tannabe? Thanks.