I have only worked with tuning a handful of Z's but I have seen a high number with FPR's that are not to spec. I replaced one with a new OEM and found it was relieving about 6 psi low. I really prefer aftermarket adjustables and I like to see an FP gauge installed.
It seems like a customer could spend hundreds on a dyno tune and weeks later have the pressure change resulting in a tune that is no longer correct.
Maybe it has just been my luck to have so many with issues...
KKROFFTNow occurs everywhere, simultaneously. But it doesn't have to be experienced the moment it happens. Every now that ever was is still exactly when it was, when it was now.
Then, in terms of perception, is nothing more than all the nows that are no longer now. Thus, the difference between now and then is when. --The Waystoppers Users' Manual 
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