Hello, new member here... I KNOW there are lots of threads on this topic.. I searched them when I was trying to figure out what would fit, what wouldn't, whether to cut the doors, or install in the factory holes.
So much info... some of it sounded "wish-washy"... I had no idea what to trust and what not to..... so I took matters into my own hands, did my own research, and found a GREAT set of speakers, that look incredible, and unlike most, were AFFORDABLE.
I opted to go with the Rockford Fosgate T162C (6.5 coaxial) in the front doors, and the T152C (5.25 coaxial) in the back doors. I did end up cutting the grills out of the doors... It was tough to do on an 06 with 1000 miles, but it was the only effective way I could find to fit a reasonably sized speaker in.
In the font doors, I cut out only the "holy" part of the grills. On the back doors, i had to remove the holy part, as well as the 1cm solid part surrounding the grills to allow for just a bit more space.
The Rockfords sound fantastic..... the grills that they come with cover the holes I cut completely, the aluminum cones really set off the interior..... and the grills actually match the COLOR of the rings that surround the A/C ducts.. almost perfectly.... even the shape of the grills matches!
This is just a suggestion. I was able to find the speakers on eBay for under $50 a set... including shipping, I've got a TOTAL of about $140 in these speakers, and they look like some awesome custom fabrication.
For those of you that are looking to improve your stock speakers, may may disagree, but this is just my recommendation.