Two possibilities that is causing the problem:
1. Ballast
2. Bulb
I’ve experienced this in the past and in my long time of using HID before switching to LEDs.
Yellow fog lamps are the best since it gives you more visibility at night compared to day light or bluish white.
Mine is LED fog lamp assembly with lamin-x yellow tint.
The cons of installing bigger charge piping on a stock turbo is that there will be increased lag. So you’ll be fine with the aftermarket intercooler alone if you don’t have plans to upgrade to a bigger turbo.
I tried Morimoto, CN light in the past. Morimoto provided better lighting than CN light but I ended up using LEDs for the projector housing since they provided more lumens than HID.