Hmmm.. I have rear sway bars on both my cars and although I haven't had them to the track yet I can tell you they both track very straight while doing long burnouts . And they handle like a dream ! I would trade a tenth for the enhanced driving experience.
Save your money....I doubt an 8-9 second 1/8th mile pass is going to get you excited......keep your rear sway bar on the car and enjoy your enhanced driving.