I think you are going to find that 100-watt bulbs of ANY designation are very short-lived, and not worth it, especially when you consider that changing bulbs on a Boxster is not a 3-minute job.
You should consider the Osram 65-watt H7s sold by candlepowerinc.com. They are H9 bulbs on an H7 base. I recently installed them in my wife's non-HID Passat, and they really made a difference. The OEM bulbs were absolutely pitiful.
I haven't installed these Osrams in my Boxster because I have the factory HID, and I hardly ever use the foglamps or high-beams...the factory HIDs are THAT good!
|