My XR6T sound like it has developed a noise behind the front engine cover. Sounds like the chain is loose to me. Car has only done just over 23,000kms and has only been tuned since 21,000kms I hve been running with thr tock tune to see if it made any difference this past week and it hasnt. I have been told these cars have some multi stage hydraulic adjuster in them. How hard is this to get to? Would it be an expensive job to get done? If anyone has pics or has found a post about this could you point me to it?