Noticing that the GC8 is becoming increasingly sluggish to start. It needs to turn over on the key for longer before it kicks into life.
It's never really fired straight up in the whole time we have had it, so I'd anticipate that it's partially a boxer WRX thing, but becoming more of a nucience these days.

First thoughts are the battery.

Anything else I might be looking for?

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MY00 WRX. 89 Prelude. 99 CRV