Either DIY the seals yourself, or pick up a refurbed unit from Dr. Vanos. When we pulled my seals out, they were brittle, but not broken. Initially, I didn't notice a HP difference, but over a few weeks, the car seemed to feel stronger. I don't have any dyno proof of it though.
"It doesn't matter if your car is the fastest on the race-track. It's a different story on the streets. Your car has to be fun, fast, and safe in any road condition." - Keiichi Tsuchiya