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The AD22VF upgrade is only allowed in Street Prepared only through a loophole in the STX allowance:
Cars listed as eligible in and prepared to the current national Street Touring (ST) class rules are permitted to compete in their respective Street Prepared classes, with the additional allowance that they may use any tire which meets the requirements of 15.3 and fits on the ST-legal wheels and within the ST-legal bodywork.
If you want to run NX2000 brakes and want to stay in FSP, don't prepare your car beyond STX allowances (except for SP-legal wheels and tires). There is not (yet) a legal update/backdate path in the rules for using AD22VF's on a Sentra, unfortunately.
Swaybars are okay for ST and SP. If the Stillen brace only attaches at two points (rather than three on a Progress tie-bar or four on a Whiteline brace), it is also legal for ST or SP.
IMHO, if you're wanting a little more serious autocross suspension, first spend the money on upgrading the Pro-Kits and Tokicos to something stiffer and more aggressively dampened.
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