An LPSU conversion of a 218 with something like a Farad LPSU can equal the sound quality of an 818v3...

I've converted several units and modifying the 218 to use an external LPSU takes the SQ to another level.
I have compared them with my 818v3 and there is practically no difference (when using it as a Roon endpoint)

Main: 861v6 (LPS), 808v6, UHD722, DSP8000SE Anniversaries, DSP5200.2HC, DSP7200.2, SW1600, Sky Q, Cambridge Audio BD, Roon, M80
Office: 861v4 (LPS), 818v3, 800v4, HD621, M&K S150P, DSP5500HC, M&K MPS2810 sub x2
Son's system: 861v4, HD621, DSP6000.2, DSP5200HC, DSP33
Spare: MCD, 100 Series, 200 Series, 500 Series, F80s, C15s.