silverstars are decent, while they last.
They really seem to have poor QC on them. On all the vehicles I ahve ever used silverstars on, they have burnt out way earlier than thye should have. If you search on any automotive forum, you will find the same issue.
A cheap HID unit off ebay will be brighter, and last longer. Plus they have a cool start up to them. I have seen several sets (so you would get enough for 2 sleds, unless you have a dual beam SXR or SRX) go for 50 dollars or so on ebay. Yes, you would need to mount the ballast but it is a small issue for much better headlights.
I would be very careful about droppinga 100w bulb in, you could have melting issues. stock bulbs are 60/55w depending on hi or low beam.
You could also have decreased handwarmer/thumbwarmer, tailight/brakelight and gauge light output if you drop a 100w bulb in.