With regard to legality of euro lights... All Euro (E-Code) LHD headlights are DOT legal in the USA (RHD e-codes are *not* legal), I printed off the DOT rules and kept it in my 4R. What isn't legal however, are the non DOT marker and turn signals found in most aftermarket bumpers (4R with TJM + non DOT TJM turn signals). The rules are also a bit vague with regard to parking lights vs clearance lights. Most US cars/trucks use the turn signal as the clearance light. Most Euros don't. That said clearance AND turns must be DOT approved, or you could risk equip violation. Many on the 4R list would just add a 1157 bulb holder to the 1156 turn signal to get a DOT approved lense. All plastic lenses that don't have 'DOT' cast into them are not DOT legal (that's all - including clearnace/turn - front/rear.
IMU E-codes are available in both LHD and RHD configs. In terms of lighting output, the LHD 1pc E-Codes should be a good improvement to the stock lighting. However, they are expensive, require a major rewiring job (including light housing connectors), and should be aimed really accurately. In my shop I do a lot of e-code conversions to 1980's/90's audis and really found the ultimate combo to be e-code LHD right light, ecode RHD left light, and use the H4>HID conversion kits inet available for ~300USD, and separating out the H3 inner high with a 100w bulb upgrade. Not really legal (but hard to tell RHD left light), but phenom lighting.
I'd like to go e-codes on my 80 someday, but it's hardly healthy for the wallet. Relay the stock us low and the high beams, and you'll have some really decent lighting until you win the lottery.
HTH
Scott Justusson
'94 FZJ80 emerald
'87 4R turbo A/T - Ecodes + R2000