Last weekend i tried a 2015 2up spark with 8 hrs on it. I have a solas 12/17 impeller and riva ss wear ring, and the spark i tried was completely stock. Mine jumps a couple times out of the water in neutral trim, trimmed all the way down it stick to the water and have better acceleration (due to the better hookup). The stock spark i tried was in neutral trim(cause it had no trim...) and would cavitate ALOT more than mine before picking up speed. I felt like it was "held back", but when it got up to speed the "pull" was actually better than with the solas! The solas has better hook up and accelerateion than the stock impeller though, and is why i would choose the solas over the stock impeller.
And yes, both skis were the same, except for mine being 3up and the other a 2up. 90hp, ibr and in sport mode.
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