As above SR20DET, which is 2.0 Turbo, google the exact specs. A quick browse through the Sierra thread he states it's from S14a but they seem to be a little confused themselves. The bracket above the exhaust manifold with the coil pack loom connector makes me think it's an S15 Spec R engine, should be easy to figure out if I'm right or wrong. 1. Is it a 5 Speed or 6 Speed gearbox attached? 2. What colour are the injectors? 3. Take the coilpack cover off and show us a pic of the coilpacks