Nice write up!
I've got a 2012 GSV50 Aurion Touring and wanted to share some mods.
I bought an Ultra Racing 19mm rear sway (UR-AR19-159) bar last year or year before, it was about $314 delivered (Sydney to Melbourne).
The same bar fits on the 50 series camry, https://ultraracingaustralia.com.au/product-category/toyota/camry-aurion-xv50-asv50r-gsv50r-avv50r-11-17/ comes with the stronger polyurethane bushes. Took about 3-4 weeks delivery, not sure how it will work with COVID atm.
Other mods:
Upgraded brakes to 2 piston kluger, pretty much straight swap of caliper + new disc and pads following a guide that was on this forum? I think.
Running bendix rotors / qfm pads.
Have KYB shocks all 4 corners
Springs have been changed to King Spring Low (~25mm drop), only really scrape on super steep driveways
Running Bridgestone S007a (changed tyre to 225/50/17 from 215/55/17 on stock rim) - Don't recommend going to a lower profile unless your car is lowered, the car looks funny, really big wheel gap.
K&N filter - (with drilled holes in airbox for more noise, very obvious on WOT) doesn't do too much.. but has nice induction noise
I've owned since the car since 2017, did the upgrades slowly over ~16 months (did installation of the bar/springs and shocks in my garage), the 19mm rear sway bar wasn't that great on it's own, but once I had new shocks + stiffer springs and better tyres, it's definitely a lot nicer to drive.
Had a trip to the Yarra Ranges in Victoria last year with a few mates who had some pretty quick cars (2013 Megane RS265 / 2011 wrx) and through the hilly parts, there was no problem keeping up within the 90-100km/h+ zones.
Obviously at higher speeds they'll pull away, but keeping it within the country speed limits through the sweeping corners, they found it hard to pull away (did most of the hilly parts in 2nd/3rd gear, used about 20L/100 lol), 80-120km/h was very similar for all 3 cars.
I'll definitely be seeing how much it'll cost for the double offset kit, probably last thing I do to this car before I give it to my wife and I move on haha.