Quote:
Originally Posted by gtengr
This makes more sense to me than the other ideas. The autos get a fair amount of the newer parts such as the bigger header, more rigid block, valve stem and cam journal finish, rocker arm pivots, fuel pump, etc. But for whatever reason they don't get the intake tract, the piston treatment, and a handful of smaller parts. Those things are peanuts as far as mpg is concerned, and from a manufacturing/servicing standpoint it doesn't make sense to have such trivial differences between them imo.
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As I understand it, most big mass assembly facilities operate with a 'just in time' supply chain. Meaning it's more cost effective to put in place a system to have a steady stream of parts delivered periodically (daily/hourly) than to build and operate a large warehouse for storing a large quantity of said parts. Not saying Subaru definitely subscribes to this method, but using up extra parts doesn't seem like something anyone would care about. Also, the update was likely finalized at least a few months in advance.