Retro air intake on trane xe90

Hi
Is it possible to convert my older furnace from room air intake to one that is feed by outside air via PVC pipe? The exhaust is PVC pipe already.

And I guess by possible i mean without too much money or risk to an otherwise just adequate 17 yo unit.

(other post)

Thx Steve

Some of the 40" XE90s had no provision for intake PVC run to them. At 17 years, yours should be one of them! Wait til time to replace and be sure intake is brought in.

Thanks baldloonie.
Steve