Super Jet Impeller pitch question

I have a 10/18 skat impeller and I can't seem to find out anything about it or what it is comparable to. I want low end and I read everywhere to get the hooker 9/15 but I would like to know where I stand with what I have. thanks
 
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I have a 10/18 skat impeller and I can't seem to find out anything about it or what it is comparable to. I want low end and I read everywhere to get the hooker 9/15 but I would like to know where I stand with what I have. thanks

Tro old 10-18 is a little more than a hooker 10-16.
 
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