I didn't know "stage 1" was just a tune. Not for my 06, and not for any of the other subaru's my friends have had, had gotten an AP. from my knowledge the accessport stage 1 flash was with either with a drop in filter or some sort of A/M intake. "Stage 2" would be turbo back and intake.. Again from my previous knowledge. I never had first hand experience with an AP until I purchased one myself. I asked the question, then did some research and came to find out there are other features such as the Anti Theft map, or Valet map. You live and you learn. And there is probably some miscommunication going on, because I'm not agreeing with you that an mbc will prevent boost creep, but what I'm saying is that it's not always 100% going to prevent it. The two (either mbc or ebcs) paired with an EWG is probably going to be the most proven and effective method to prevent boost creep if your going to be catless. Also, if your going to be catless and want to be even safer, invidia offers an excellent downpipe with a bell mouth/ divided waste gate. Rather than an open bell mouth which is going to be a tad louder, however increase your chance of creep.