[Hal H]

There would be significant imbalance issues idling in 4-cyl mode. It would feel like the engine is mis-firing and most any customer wouldn't find that acceptable.

When the engine is turning at +2k rpm, the firing intervals (when MDS is engaged) occur frequently enough that you won't notice except for the exhaust sound change.

 

[vfxR/T]

Didn't think of that, I guess it makes sense.

 

[64SportFury]

I think it is the fact that when you leave the light you want all 8 working for you, not 4.