Guys and GT500 girl

, I had this same problem. But I would be careful about plugging the hole with cilicone. There IS actually a breather hole on the oem cap, it's hidden underneath the top cap.
Someone told me so and I didn't believe them so I had to take it apart to see it. I don't know what could happen if you didn't let air in or out of the pwr steering canister. Probably would just become really pressurised when it got hot. Either way, I just threw my set away and ordered this supertrick set with carbon fiber in them that has just been realeased from another company. I orderend mine from lethal perfomance but I suppose everyone will be carrying them. I guess we cant post pictures on here but you know how to search the internet right?

And yes, I already checked this set does have a breather hole on the pwr steering cap but it's underneath just like the oem cap so no water will get in!