Can i retroFit a VS to a whisperflow housing?

[Brando]

Im East south East of Phoenix about 25 miles.
I have a pentair WhisperFlow:
http://i.imgur.com/8sDyw89.jpg
single speed 1.5 HP i believe. Ive replaced the motor with a rebuilt about 2 years ago.(Perrys Pool pump Phoenix)

I also have one a neighbor tossed:
http://i.imgur.com/X5nUUVp.jpg

Ive heard a lot about VS and think it may be worth having when this one dies. BUT can i use the existing pump housing and retrofit a VS motor to it?
Just looking for least expensive alternatives.

Thanks for the guidance !

 

[pooldv]

Yes, I'm pretty sure Inyo Pools has a fairly low cost VS motor they can sell you that'll fit that pump.