vibrations won't brake them as most will say there viration tested, but some ballasts are not top quallity so i always used to do it can't do any harm can it??. I have fitted many kits on Hyundais as i was the first person in the Club to put them on my coupe and it has been somin i have always done. Don't have to do it but it just stopps metal on metal. Most will say splash/water proof and vibration tested, but theres 4 or 5 people i know from Bucks Vag and the MK IV golf forums who have had there blow by water damage, so what they say isn't always 100% correct.. Might just
help thats all.
All the standard ballasts, such as the ones in the Subauru, will be of much higher quality then the cheep after market kits. a new hella ballast for a BMW is £250 for example
Looking in my engine bay i honestly can see anyware else where they can go securly, unless you put them under the light unit? like most BMW's.
You could say the same for puting them in the the wings.
where has everyone else put them?