Juujai wrote:things to look out for. um "most s13s" have ripped up drivers seats, the turning signal thing next to the steering wheel is usually faded, check engine light plays peekaboo, timing chain guide causes a rattle it ticks (not a big problem though) , moonroofs are no good if you're looking for weight savings and body rigidy/head clearance (they also make noises after driving speeds past about 40mph
Other than usual "old car stuff" and visible wear and tear, look out for rust on the trunk lid if the car has the OE spoiler. That thing seems to inevitably lead to rust.
Listen for a hollow tapping sound near the front of the engine under the valve cover. This is most likely the all too common timing chain noise. It's usually not a big deal, but any problems in the lower timing chain could result in bad, bad things since the KA24DE engine is an interference design.
Front crank seals tend to leak, so look for messy, oily engines.
Other than that, the car is fairly sturdy. My 2nd gear synchro gets a bit grumpy in cold weather, but for a 12 year old car it's in pretty good condition ('93 Fastback).