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18 Besides the three mounting locations that have to have their threaded inserts drilled out, the main booster pushrod hole needs to be elongated following the template included in the booster kit. A carbide cutting burr is a good tool for this step, but a cut-off wheel can get the job done as well. Lastly, the two horizontal bolt holes need to be slotted outwards and the dimple just above the steering column drilled out as well. Your firewall should look like this now.