ViRuS

Can I remove the soleniods after blocking off the ACV and EGR valve? Also the twin scroll after swapping in an s5 turbo? So 4 all together. Green, yellow, blue and grey. Also can the line coming from the manifold used for 3 of those switches, be used as a vacuum source for a boost guage or WG? Its still going to be used for the orange solenoid though. But that same line was used for the 3 other switches and one of them controlled the Switching acuator (gone with the s5 turbo). Thanx for any help you guys could offer! My cars idles really rough.

NZConvertible

Yes.
Boost gauge yes, wastegate no. Use the nipple on the turbo compressor housing for the wastegate.

ViRuS

No nipple on the housing. But could they be used for a bov line or a mbc line? Then I could free up the line from the manifold and use it for the WG. Would that work? Or is there a better way?

NZConvertible

If this is an S5 turbo, there should be a nipple on the compressor housing for the wastegate. If there isn't the compressor housing isn't stock.

There's no nipple on the manifold to suit the wastegate hose (1/4"), so you'll have to put one on. Dont use the small vac nipples for this.