single questions

[LRP]

just sorted out the pile of need and dont need !
the nest what do you need to keep ?
dump valve i hav a bailey one can i still use it or is it not upto the job or worth the hassle of plumbing it in. should i get a better one and were to fit it?
wher can i get some stainless pipe to make up the down pipe 80mm i belive?
and do i need to run a screemer pipe on my tial wastegate or can it go straight to air?
cheers