Quite simply: Overly rich = bad. The goal is NOT to run overly rich when you shift... it causes a big power loss when you finish shifting and get back on the throttle. Personally, performance is more important to me than some cute little whistle.
Some people compromise by installing a BOV AND keeping the stock BPV. This cut's the over rich condition down quite a bit as not all air is being dumped. There's still a loss though.
Anyway, if your car isn't stalling and you're not worried about squeezing every last bit of power out then go with it.... just pointing out that you may experience issues. And if you are looking to squeeze out every last bit of power then you really need to look into a fuel control system anyway (most of which will let you tune out the over rich issue).
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