The Street Challenge kit includes a tubular 11/4-inch Muscle Bar front sway bar with trick Posi-Link end links. Compared with the stock-type rubber-bushed end link (left), the C6 Corvette-inspired Posi-Link features encased ball joints on each end and is virtually solid. The result is that the roll bar reacts instantly to body roll. By contrast, rubber-bushed end links compress momentarily and delay the onset of roll bar influence. Great for boulevard ride, bad for maximum suspension performance.