that is what I was thinking. That is why I think it was bad tuning from the beginning. Did you have it dyno tuned with a wideband air/fuel? or was it with a tailpipe sniffer? The tailpipe sniffers are usually about a point off what it would be with a wideband. So your A/F might have been off.danworth said:a BOV isn't going to effect the running of the car on boost. it may make it back fire on lift off as it dumps the air if the BOV is inbetween the AFM and TB and if its an atmos type of course.
it shouldn't of made the engine go pop thats for sure.