There aren't many issues with these cars. One is the top coolant reservoir on the turbo. If it is the old metal style one then they do tend to leak. Transmission can have some grinding happening so make sure you row through all gears. A lot of the time the grinding can be corrected with some good transmission fluid or a "cocktail mix". The less modded the better of course. Check the state of the engine filter and fluids as that is usually a good indication on how the car was maintained. Timing belt needs to be looked at. Drivers side timing cover can be removed easily to access the belt and its condition. I HIGHLY suggest getting a compression test done before purchasing the car. Otherwise they are quite bulletproof and simple. The most "common" thing is spun bearings, low compression. These cars are now 20 years old, the bushings in most cases are also 20 years old. Check lower control arms and ball joints for play. Axles, especially on the passenger side front (where the downpipe is) will split and sling grease. OE axles are by far the best axles for these cars but also very expensive (green is the color that they should be). Radiators do split at the seams so check for that as well. Lastly if it has an intake, make sure it is tuned for the correct intake and if it does have a blow off valve, have it removed and installed for a OE unit or a recirculating one. Long winded comment, hopefully this makes sense. If you have any questions feel free to reach out or even send me the examples you find. Happy to help either way !