You would have to ask Roger from FMS about the length of the springs. Goodluck with him anwering the phone or responding to an email. About swaybars, there was a post of someone adding a bar to the rear beam and stating that it stiffened the rear. Adding a second bar to the aspire rear will stiffen up the rear and reduce understeer. I rarely drive fast enough to induce under/oversteer. Adding an aspire front bar will make the car more enjoyable for normal driving since there will be less body roll. Adding the larger engine/trans will change the balance as well. Perhaps adding the aspire front sway and rear beam along with a second rear bar would be a good set-up. You could change the second bar in the rear with a thicker one until you find the balance that you like. Kinda the same concept as in this video.
http://www.youtube.com/watch?v=9xr7ktz1_as
http://www.youtube.com/watch?v=9xr7ktz1_as
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