If you install your component set at the rear, you lost the feel of front image staging...

Just mod the front door bigger hole to support 6.5".

Besides currently my kancil is fitted with 16cm (6.5") speaker on the front door. I get the front image stage feel because i use my 6x9 at the rear convert to low band only. But the problem is i need an amp to power up cause the WATT rating is too high that my pioneer can't handle it well