3MO 6 Speed Sequential gearboxes for longitudinally mounted engines using Rear Wheel Drive for Circuit/Road Racing, Rallying, Off Road Racing and Drifting. 
TXL 6 Speed is superlight @ 59lb / 27kg and rated to 450 lb-ft / 600 Nm (1000 Nm in drifting). 52 gear ratio choices.  
TXB 6 Speed is robust but weighs just 79lb / 36 kg and rated to 665 lb-ft / 900 Nm. Built in Drop Gear system allowing four overall gearbox ratio changes in 10 minutes. 52 gear ratio choices.