Well, nothing can stop you, and the police probably won't either. But shining $400 worth of extra light into the trees (and oncoming drivers eyes) strikes me as a waste of money. A $25 pair of Hella LightPowers behind $250 e-codes will cost less and put more illumination on the road.

Of course, the best combination is e-codes AND HID's, which is what I'll do when HID aftermarket kits from a reputable brand reach $250.

Late model is S80, S60, and 'new' V70. I'll bet 2001 S/V40's are equipped with E-codes too.

You can check your own lenses, Embossed somewhere on the lens glass, there should be an E or E2 in a circle, no US DOT. (If it has both, it's a hybrid. The hybrid would be minimally useful, but I don't think Volvo makes ECE-DOT hybrids.) If it has just DOT or US DOT, then you have the weaker lensing.
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David \\ (98 S70 T5SE Black, misc mods (mostly lighting), red calipers) (92 940GLE)