Yes you can use the BMWPE with Stage 1 Aggressive without any problems but, it is recommended to delete the factory mid-cats to get the best from the tune.
I used Stage 1 Aggressive with stock exhaust - all good, very fast but sounded quite tame and perhaps a little choked up top. I then used it with PE which definitely made it feel more pokey down low and more free up top; more power up there. I then fitted N55 mids and the tune is at the best it has ever been. It's seriously aggressive sounding and there's power all over, nice and smooth. I hear that Stage 1+ FMIC is that plus more.
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