Haven't spent time on this but when you get a 6 blade it comes with the reinforcement tubes around the bearing, at the one I've bought.
Now with that in mind, all the reading I've done says the cop pumps have the reinforcement tubes around the impeller bearing, so...I guess?
I was thinking hot pursuit/high speed chases vs cooling time and such.
City trucks got the 8 blade from what I've seen cause they do nothing but idle.lol
jmo