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Ive been running my bbk since I got my car at 52k miles. Adjusted it properly and haven't had a problem since. That being said bbl has a kinda meh reputation. Probably wouldn't have been my first choice had my car not had a bbk on it when I bought it.
It;s just an alloy casting with a hole in it, and a shaft with a throttle blade capable of blocking off or opening the hole--ain't on bit of rocket science involved..