I ordered an adjustable pop-off valve for my 83 turbo and it took about four weeks to come with a part missing. I ordered the HKS built item in the 12 to 18 psi range and when it finally got here it was missing the collar-flange that screws into the intake and provides the mount for the valve. I called two weeks ago about this and still haven't seen it even though they told me it had been mailed out already. I have been ordering and receiving packages from relatives and companies from the left coast for 10 years, and never has it taken this long, even during christmas. So, needless to say, I feel I have not been told the truth. I already got the credit card bill and paid it off. This is poor service.