Seven Marine 557 Outboards in Action (Warning LSx content)
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On that 525 to 300 merc outboard your not comparing apples to apples , why ? Well in our world weight is our arch enemy and for example 2 merc 525 engines with drives are much heavier that two say 300 XS that weigh 1010 for pair . That 525 pkg is much heavier therefore robbing HP to push same boat with pair OB
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heres what they sound like with apair of outdrives
http://youtu.be/xMJ2rdMVuiM
http://youtu.be/xMJ2rdMVuiM
http://youtu.be/4_HJnwL4lAA