In case anyone out there still wants to know, the TRD rear sway bar I just put on my 2013 LE Corolla made an IMMEDIATE difference. I'm actually less tense when I drive because I don't have to correct the understeer all the time. I bought it used with 28,000 miles on it, and I've been replacing worn out suspension parts since I bought it, hoping that they would make the difference to tighten up the steering. Of course ball joints, inner/outer tie rod ends, and sway bar links made a difference but I was very confused when it STILL didn't handle very well after all of that work. I might get crap for "wasting" parts that weren't worn out, so, disclaimer, I replaced those parts when they were worn, at about 75,0000 miles. I replaced the front sway bar bushings at the same time as I upgraded the sway bar to the stiffer TRD one, but I test drove it in between jobs so I was sure that it was the TRD improving things, not just the bushings (which cost about $30 OEM compared to $200 TRD sway bar). I was amazed by the difference. I might be extra sensitive to how my car rides than some other people, but I could tell the difference when I SAT in it, and I weigh 160 pounds. The difference I felt was that my car didn't wobble as much (which of course I at first thought was just in my head, but I feel it every time I sit in it). If you want turns and those micro-corrections you make while driving straight to be more accurate and less frequent, a stiffer rear sway bar should be your first upgrade IMO. I bought the TRD one because it was built by the manufacturer and I don't want any mysterious issues arising. I hear the Megan Racing sway bars are good, and to be honest I wouldn't be surprised if some companies buy TRD bars from Toyota overstock and are allowed to rebrand them. No company is perfectly efficient, and they need to move excess product. Anyway, I had a hard time finding a thorough explanation of the sway bar upgrade experience so there is my long-winded addition to the topic.
