Ohlins TTX Advanced Trackday Coilovershlins Advanced Trackday kit features the famous TTX (Twin Tube) technology. In this particular version, its custom made for the Porsche Cayman GT4. The unique combination of a 46 mm, two way adjusted, through rod and lightweight McPherson strut for the front and a 36 mm rear mounted TTX shock will completely transform your car. The TTX 46 and TTX 36 shock absorbers are developed from hlins participation in GT and Touring car racing. That gives hlins