spector v this is bbk's words on the octane i was just quoting what i read when i installed mine years ago. this is copy and pasted directly off there install sheet.
Due to the increased airflow and performance gains associated with this product, a slight detonation or lean condition may occur if used with low octane fuels (Regular). If this happens we recommend switching to a fuel with a higher octane rating (Premium, or Super).
In addition, if you are installing this product on a vehicle that has been previously modified or has a "tune" other than stock, you may find it necessary to have the tune adjusted or modified to accommodate for the increase in airflow that this product provides.
Please visit us at BBK: BBK Performance Parts
to view a fully photographed installation of this and the many other BBK products available to help maximize the performance potential of your vehicle.