I have two people I ride with twisted kits they are awesome very well thought out kit. No lag! the only down side if you see it that way is mixing you fuel the stock oil injection pump is used for the turbo very nice I may be buying this summer
I know a couple of guys that are running these kits on there M1000's and they are running at 11psi boost and are having a hard time getting y-pipe's to stay together. One guy is on y-pipe #3 i think
I think D&D makes a trubo Y pipe. My buddy is running a BD race gas turbo and thats what is on his he runs any where from 10 - 18 psi and has never had an issue...... yet!
Also if you talk to powerclaw on here he sells the Twisted turbos and he would be able to tell you for sure what to do about it.