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I had the dumb and I apologize for bringing you into this. Ben said he has Twodoor's old car and I mixed up names. Also, you are now in Mississippi now, right? He was saying he was going to MS to pick something up.
I'm kind of hesitant to post this, in case I'm still mixed up. But I can only learn.
The 1.125" Racing Beat sway bar is the one you want and what most of the guys on the mazda-speed forum (RIP) preferred despite the fact that the 1.25" was recommended.
I originally had the 1.25" bar and switched to the 1.125" bar after recommendations from other users.
It's surprising how much extra room becomes available with the slightly smaller bar - VERY important when it comes to intercooler plumbing routing (cold side in particular).
Also, you'll need the Racing Beat Bolts&Braces kit or chunky sway bar mount brackets with these bars (especially the 1.25" bar) because they'll tear the OEM brackets right off:
Note: This is NOT a Racing Beat sway bar but is a great photo of what will happen to the OEM bracket with a stiffer sway bar.
I would have loved to hold out for one of those, but I think I did pretty well for my price range and the location. I really didn't want to have to travel to get something though I might have rethought that now.
Would have been nice to get a car with a 6 speed and torsen from the start... The cost probably would have evened out. Oh well, it was a good learning experience!