can i use silicone vac hosing on the 2 actuator pipes ? and the surrounding connected pipes ? or will it melt/collapse?

Ive got the main ones eg dump valve done in silicone vac hosing already

reason for asking is they look old and frayed
 
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these 2
06012009028.jpg


and that 1 and the ones connected to it
06012009030.jpg
 
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where abouts is the second picture taken? that pipe looks like it needs replacing. i'm sure the other two are already good silicone hoses though. i never bothered replacing them on mine as they are a solid :)
 
i replaced the hose in the second pic.. but then get rid of it all as i removed the SAI and N249. so its up to you what direction you want to go in.. you can either replace the pipes.. or remove the systems lol