No, Sylvania XtraVision bulbs are just regular OEM-type bulbs of a slightly higher output. Not sure how they achieve this, either with slightly higher wattage or a different gas fill other than halogen, or whatever, but it definitely does work. GE sells bulbs like this that are equivalent, they're just labeled "High Output" or have "HO" in the part number (9004HO). Last I looked, you can score a pair of them for less than $30, and they're worth every penny.
Again, Silverstars are just XtraVision bulbs with a blue tint. Sylvania also sells (or used to sell) a "Cool Blue" bulb which was just the standard OEM bulb painted blue, making it even more lame than the standard OEM replacement bulbs - same bulb, less light output due to passing through a color-filtered barrier. Any higher-end Silverstars are just a ripoff on top of a ripoff, IMO. Kind of like some joke Pops always loves to use: "What's the white stuff on chicken poop? More chicken poop."
Absolutely DO NOT try to poke higher-wattage bulbs into the stock sockets using the stock wiring. The stock wiring arrangement is a bad idea to start with - again, it's already pulling way too much current through way too far a distance, creating way too much resistance - and trying to draw even MORE current through there is a good way to melt wires and start an electrical fire.

Think of a wire as being like a hose; the smaller the hose, the less you can pull through there, and the harder you have to push to get the same amount through there. And the longer the hose, the more effort it takes to push whatever through there, too. Except when you try to push too much current through too small a gauge of wire, instead of it simply popping like a hose would, it builds up lots of heat until it ignites the wire insulation and/or whatever else is around it. Not good.
If you do the relay mod, using heavier-gauge wire, THEN you can run higher-wattage bulbs. Otherwise, you're ... ahem ... playing with fire.
As a side note, I hope that when your 3G swap (130-amp alt) was done that you used AT LEAST 4-gauge cables and that you upgraded the engine grounds. And the same applies to your using 100-watt H-1 fog light bulbs which are WAY higher than the stock rating for bulbs; if the fog light switch was modified in such a way that they added a relay up closer to the lights, that's good, but if you've got all that high-current wire running to the stock switch still, you're looking at a potential fire hazard in your interior instead of just in your engine bay.