the CA18det is great because between the CA20de and the CA18et you can get most OEM parts needed to fully refresh the entire motor from local redneck NAPA stores and what not. Also, as far as after market parts go, last time I was looking (a while ago now) Ebay actually had a constant supply of good parts. So its worth a shot to check there. On the NICO boards they should have a full list of interchangeable parts from USDM CA motors