Right impeller for 650 conversion?

[Jksuperjet]

Im throwing a 650 into my old 550. Has the stock 550 prop and pump, and no idea on wear condition. What would be the best setup? Not worried about top end, more interested in low end grunt.

 

[Summetyme1]

18 or 19 depending on mods:


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[Scuttle]

Ill check what I have in my 550/650, it has some good low end. Just happen to be out of town right now.

 

[impulsiveRX=7]

Skat-trak 19 in my 550sx/701