My first motor was the orignal, It was barley running. Dont know what exzactly was wrong but that really dosent matter anyway. I took it to z1 just to do a jdm swap. I purchased The JDM for 2k.. in August from an outside company that would hold a warrenty. Z1 installed it and and I was on my way! A week later it was smoking. ok my fault! Still having the warrenty for the JDM motor that I purchased (not z1) they replaced it and sent it to Z1. Z1 told me your better off rebuilding! ok, they gave me a price that was a few times more than JDM motor and they used that new jdm for a core. that was back in November, Since then I've been back and forth 6 time, First oil leak & cam broke! back to z1 for another couple of months while they pull the motor, sent it back out to have the heads redone again and new cam.