I wouldn't hurt the cars peformance just for a sound. Get a crushed 1g bov and you would hear a nice sound with the recirculation tube. I tried what you did when I had my TSI and it did the samething. The recirculation tube is there for a reason.

Doing a GM MAF setup may solve the problem. Finding a used VPC setup would be best. HKS doesn't make them anymore last I heard.