vct noise, turbo/exhaust gasket, tierod ends, caster rod bushes, subframe bushes, cup holders, electric windows, interior fan/heater only working on setting 4, wheel bearings, rear boot latch and rust around boot, front seal timing chain.
here is a small compiled list of things to look out for on these cars, i researched them when i brought my s14, most of them carry over for the s15.
the 6spd gearboxes are weak as piss, as they added 6 gears inside the case which was originally meant to have 5 gears (that are still pretty weak) its always 3rd gear that strips or rips from its foundations under heavy load/clutch drops.
a mechanical difference between jap and aus s15's are the jap versions came with ball bearing t28 turbo's and the aus ones did not, limiting their safe operating psi to 15 instead of 18 for the bb ones.
alot of people cram extra boost in there and ad a front mount thinking their car is mega powerful now, this is not the case the computers are **** and when upping the boost 90% of the time causes detonation. (but more torque gains)
parts can be cheap if you want them to or only do basic replacements, the expensive things are the upgrades (turbo zorst injectors computer) everything else is pretty good, most expensive thing i have replaced in mine is 4 wheel bearings at a total of $380.
nissan still sells genuine everything, but there is alot of upgraded parts available which are better, and bursons/repco sell aftermarket oem equivalents for pretty cheap also.
a good example for parts prices is here
Genuine Nissan Parts! + NISMO Parts! - Hardtuned.net this guys prices are pretty average and the same as shops but i needed it for the needle roller spigot bearing as i couldn't find any around here.
motor is strong, probly dont want anymore than 300rwkw any more and your motor would be very close to pushing daisies 250rwkw is a good safe bet for stock internals, incase you think this is a low number remember that the car is only 1200kg odd and you see this number from midway through the rev range and it just sits on it, compared to seeing it as a final figure on for e.g. n/a cars.
i know alot of stuff about these but just dont know how to say it properly....
enjoy.
