I've read the DIY for installing R32 taillights. It doesn't explain WHY this modification is required. Do the R32 tails light up wrong? Also, some sights sell US R32 tails and others sell Euro R32 tails. What's the difference? I bought HELLA R32 tails (w fogs) from TMTuning. I will not be using the rear fogs. Do I have to do the wiring modification?