Hmmmm. I really don't know, thats odd

:
06 LS MS6
07 BM GT (shell has been struck from the roll)
what dash hawk param would i log to evaluate the best spring / shim combo on a BPV


spool time and afr ??
 
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To check if your BPV is leaking, all you really gotta log is Vac/Boost. If you're on stock tune, it should peak to about 15-16psi then fall down to about 11-12psi by redline. You should start with a blue spring/no shim. If you got more mods add the 2 shims in there. If you run more boost than stock, use the red.

Log KR, Actual AFR as well just for giggles.
 
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