2007 335i e93 problem

[jesus e93 335i]

Hi, i have a question, i replaced my clutch a month ago i put a twin disc dkm clutch on my car because i plan to go single turbo by april of 2020 or summer the problem is that the other night i was driving the car fine and out of no where i go to shift into second gear and it wouldn’t go in and into any other gear what might the problem be i need help asap because this is my daily driver im sad because i spent 1400$ on the clutch and 800 on the install and as well its a single mass flywheel and it made a clunky sound and when i would press the clutch it would go away i need help

[White94RX]

Could be the slave cylinder. A guy here at work put an upgraded clutch in his 335, and then his slave cylinder went out due to the extra pressure of the upgraded clutch. He replaced it, and everything was good after that.