Yamaha 150 or 175 for my new boat

One more note on the SPS setup. My best friend just bought a new 21SLX out of a dealers leftover 2014 stock. It came with SPS and the maximum it is rated for is 150HP.


Not that he needs any more as when we took a test ride it did 42mph
 
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What brand motor did he get Link?
 
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