Hi I am from Patna have booked a VW polo 1.6 and expect to take delivery in 10-15 days, god willing and although it comes with an ICE, it is pretty basic and I would like to replace it with a better model. I have zeroed in on Pioneer 3350 BT which is available here for around 20k . Should i leave the stock speakers in and just replace the HU or should i change the speakers as well. In % terms how much would be the Sund Quality difference. More than the cost of the speaker, I am worried about the wiring job voiding the warranty on the car. Budget is around 30k including the HU.