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Theres not really a HP limit I think its just how easy or hard you are on it, and how well its been taken care of. Like one guy said, there are people with 700rwhp on them that are fine, and others with bolt ons breaking them.
they're not quite like the ten bolts...if a 60e is properly maintained and not regularly or severely abused, it can take some serious power. not for too long tho