You are dealing with 2 problems in the stock location.

Depth of the speaker inside the door. And Height of the speaker above
the door panel.

Anything more than flush mounted speakers, will hit the side of the
dash. Anything more than about 2 1/2 inches deep, will require you to
cut the vapor barrier pocket.

With that said, a previous owner did fit some 5 or 5 1/2 inch speaker
in my passenger syncro. As they aren't flush mounted they hit the
dash. I wish they had gotten MB Quarts and flush mounted them instead.

On Sep 3, 2008, at 4:16 PM, Robert MacDowell wrote:

> What's the biggest speaker i can get into the same area as the
> factory installed. I'm thinking 5 1/4 inch would be the biggest.
> That's if i can even get those in. What's the opinion of the
> experts. I don't want to cut the bottom of the door panel. I already
> have them on the old panels and don't want to do that on the new
> ones.   Thanks