This is more of an out of interest thing that enything else (and prolly a stupid question at that) but here goes:
Got this plug on my loom, its kinda like the octance plug on the 8v's (but I dont think it has the same purpose on XE's as they adjust automatically don't they?) but instead of 95/98 it has A/B on each side.
What the hell does it do? lmao
Haynes has no mention of it. Someone told me it changed the ECU map for better performance, but dunno if they are right or not.