well i own a 97 gsr and recently took off my turbo kit and threw the stock header and exhaust back on. i left the cold side charge pipe on with a filter on the end of it. the bov is still there with the vacuum line plugged in. i plugged off my oil feed and return lines aswell.. now im having an odd issue, im currently running neptune rtp with a base gsr map adjusted for 650cc injectors ( the adjustment was automatically done in the ecu's injector parameters) and it idles fine while its cold, but has this weird air sound i cant pin point from engine, and when the car warms up and the air sound can be heard closing off and the idle turns bad and will stall out when driving and pushing in the clutch...

i never heard this air sound when the car was turbocharged so im pretty confused to what is going on.. any help is appreciated

 

why not put the stock intake (whatever you had before turbo) back in and block off the vacuum port for the BOV and see what happens after?