Years ago I had a slight kink in the BOV return line after installing a Dejon intake on my FWD. It didn't allow the 1G BOV to vent freely, and it made the valve "flutter" even under light boost.
Lots of good reading on surge in this thread:
Went Snowoarding over he weekend.... got compressor surge around 3500ft
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~Justin~ '92 TSi FWD, '93 TSi AWD, '97 Eclipse GS
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