rob: sa age ng oto and the HID system palitin na talaga yung bulbs nyan and I repaired a few mazda6 already. You can change the bulbs to 5000k but dont go higher coz mag drop yung performance nung lighting setup mo.
horsepower: we can install bixenon projectors and change the stock bulbs (if your stock bulbs are entry level type). If the stock projectors are not very good incl the bulbs then you can see a considerable increase. I need to see the car first to make my final recommendation.
2. we install clear lens projectors only. too much talk by so many sellers with little experience
3. I dont install 50w setups anymore, matagal na rin. use stock ballasts and wiring harness. pm me or sms 0908 8183545