Port Tune Question

[xAndrew225x 8]

I have a buddy that got a got a box from another friend for free and we noticed the port area after the turn at the back of the box isn't as wide as the port at the front. The first length of port is 2.5" wide, and the second length is 2".

Will this cause any major difference in sound? I'm guessing it will slightly tune it less at 2" than if it was 2.5" in the 2nd length.

Example:

[xAndrew225x 8]

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