1) i dont know if the US's MS6/06 mazda6 has DRL(Daytime Running Lights), but here in Canada, they've switched their DRL to highbeam instead of lowbeam... so that's not really HALO or bright parking light... but if u want to install a DDE, get this
2) the brightness of OEM HID(Xenon) depends on the car itself... how the headlight is designed and everything, the OEM Bosch E46/Audi TT Projector are very reliable in term of size and output... for better output, there are many other projectors, but retrofitting other projectors would waste lots of time and not worth it if u have the OEM HID.... but if u like different route, check this..
3) It's useless to change ur high beam to HID... first of all, since u r going to flash ur highbeam, it's bad for the ballast !! rule of thumb, never flash ur HID or never turn on/off ur ballast 3times/hour... secondly, if u have the 06/MS6 HID option, it's bad for the HID kit to turn on with the DRL(less wattage to the ballast/bulb) <- not too sure about how the HID option works on the 06/MS6
Tanabe GF210 Springs, AutoExe CF grill, Retrofit (Bosch E46/Audi TT DOT projector) + Philips D2S 5000K (85122+) bulbs, Lower fog, 2 x 10" Sony Xplod, MTX MXA6001 Class D amp, 12" Varad White LED bar + 4 x Varad single LEDs, Airbox Mod, Sidemarkers Mod, Taillight Mod, Foglight Mod, Clear sidemarkers, 4 x white 6-WLEDs, 4 x white 5-LEDs, 2 x orange 5-LEDs, 2 x Polarg Hybrid XenonWhite 194 bulbs, 2 x blue 921 LEDs, 2 x OEM muffler tips,Redline MTX fluid, Ichiban Shift Knob, Ractive Shift Boot, TWM short shifter, Focal PolyGlass 130v1 components, Infinity 6802cf, Duplicolor Red caliper paint, Royal Purple 5W20 Synthetic Oil, Hawks brake pads