Pretty much standard practice on many stock quad shocks. looks like a Can Am shock. When the coils contact each other (coil-bind) they become null and void so the spring rate climbs significantly as now only the top section of the spring actually moves...in theory the lower section is now solid
Does it make a difference as to dynamics if shock is wrong way in? Not fussed for unsprung weight theory, more so if coil rate is affected. My (limited) unstanding suggests that spring will collapse at weakest point (assuming no physical impediment). Thus, spring could be fitted either way around?
I know some shocks have reservoirs etc and should be fitted correctly.
Do some bikes rear shock slant a bit? DD just being prissy...... Hahahahahaa
Looks like a stock Blaster shock to me. IMBW tho.