Having owned a chassis dyno for several years.. I know that any HP differences from having or not having a catch can after thousands of miles will not be measurable between the existing inconsistencies pull to pull, car to car, day to day. You would need to pull data from a very large number of otherwise indentical cars to see if there is a true pattern. Even then, if anything were found, its safe to say that we are probably talking about the worst HP/dollar ratio out there. But I ever lose a race to a 370z with an oil catch can, ill reconsider!
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