300/440/550 Is a milled 440 comparable to a 550?

I'm might be buying a 440 with milled head coffman exhaust, and a solas impeller. The question is is it comparable to a 550 in power. i'm more in to freestyle would this be a good ski? thank you
 
A good worked 440 can be a lot of fun and can rival a 550. It will never have the punch of a SJ but it will let you learn to ride a lightweight hull and learn "power management". If you learn to ride a 440 it will make a SJ feel like a barge and you'll have a very easy transition.
 
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