The fogs used really aren't that expensive, I would have thought that they would fetch much more but I've seen them go for less than $100. ...but if you're still on a tight budget.
Also, the look of the car on the left is different because its a bugeye.
The STi fogs look stupid being tiny and all and I don't know if you would have any wiring issues, hooking the more powerful '02/'03 fogs up to your STi.
Personally I like mine and they're really useful for nighttime driving, spreading out a ton of light, its hard to tell my lows from my highs but I also don't have HIDs like you do.
Most people opt out and even if they have the fogs just get the STi covers. I guess they make the car look sleeker and fill in the gaps on the front end.
I've seen cars that looked good with the fogs, and I've seen cars that looked equally as good without fogs. Stock vs Stock its a tough decision - modified, I will either get them or chuck them based on the rest of the style you plan on creating, but I highly doubt you're going to modify the exterior.
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he can't afford WORSE mileage
It gets better mileage on COBB.
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get some amber fogs, they look sweet with HIDs.
most "amber" fogs that you see on WRX/STi's are yellow rockblocker film over the fogs. Looks good though, especially if you have gold rims.