I'm new to the forums. I went into the tech forums but had difficulty finding enough DIY for the B8 A4. I want to switch out my interior lights with LED's and I want the same for my Fog Lights. Any sources you can recommend? I think the dealer will not be much help here. I also wanted to ask about changing the thickness of my tires. I was told if I switch to a 19" wheel I'll lose ride quality, but what about a 18"? Will that be smoother than the 19" because of thickness?