1971 Polaris 2 + 1 - In the Polaris lexicon, you could justifiably substitute the word "Performance" for "TX". A TX sled was built and bought for performance, power, speed, and for racing. The TX series was launched in 1968 and lasted more than a dozen years. In motorsports, performance sells, and the TX models certainly sold well for Polaris. This 1971 2 1 model was the predecessor to the later Starfire racers.