Serious Autocrossers?

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Originally Posted by ozmdd

That is not correct. Again, not trying to bust on you, but you should read the SCCA rules. Your car was not available from the factory with that part, therefore it is not class-legal. Just because Toyota sells it through their dealers doesn't make it legal. TRD also sells lowering springs and a CAI. It must have been produced at the factory in that configuration, in that model year, in the package you own. So, even if they start making the rear sway standard on the 2011 "S" package, you can't run it, because you dont; have that year/model.
Same thing goes for your 6.5" wide wheels.

Stock class is extremely strict, specifically because the cars are carefully class to be competitive. You are currently being given the most generous PAX index of any car in autocross, but your car has been given a significant handling improvement over your HS competitiors and the rest of the feild by way of your PAX. You wanna win that trophy fair-and-square, right?
If you doubt me, post the question on your local SCCA forum.

i thought - and i could very well be wrong - there was a little loop-hole called 'port installed option' that allows the trd rear anti-sway bar on models/years that had that option available? again, i don't autox(yet), but i've done a fair bit of reading on the matter of hs prep and i think there's nothing wrong with taking every LEGAL advantage you can.