Quad beam mod for the TBSS as well as the 02-09 gmt 360/370 platform. Normally when the highs are activated, the low beams will turn off. With this mod, the lows will stay on when the highs are activated. Can also opt for the fog version so that the lows, highs, and fogs all remain on when highs are activated. 
 
This is installed in the fuse box in the engine bay and photo instructions are provided.