I've been trying to figure that out. From what I've read, since these engines do not have mass air flow (MAF) sensors, there should be no problems with it running rich. And I haven't seen mention of any other problems it could cause. I've driven a couple hundred miles with it now and have gotten no CEL and it's been running great. Still trying to decide i I like the extra noise or not. When I was younger, I loved it, but now I go back and forth.
BVP deletes have been a common modification for years, and in the long run it will be harder on the turbo. But with proper maintenance and care, I doubt it would cause any issues. May just want to keep an eye on all the intake related seals.