I had a proportioning valve from a Fiat Uno. They asked me what it was and I explained. It isn't adjustable (in stock form) so it passed.
I do seem to recall that bias bars must be locked and non adjustable too, nuts welded after adjustment for example but I didn't have one.
1.6 Mazda B6 : Garrett TBO339 : 420cc WRX Injectors : FMIC : Microsquirt V3 : LC-2 Wideband : Toyota COP
Build Started Jan 2013 : OTR Aug 2014 : Build Pictures