The air filter air intake system on a Mark VIII was designed to quietly ingest the correct quantities of air as it glides silently down the highway. There is a small round opening out the bottom of the airbox, which restricts and silences the amount of air entering the system. To greatly increase the amount of fresh air available to the system you first remove the entire airbox assembly from the vehicle by removing the 4 bolts holding it to the inner fender assembly. Next, remove the front part of the airbox from the section the airfilter lays in. Mark off a grid pattern approximately 6 by 8 inches or so and begin drilling a series of _ to 3/8-inch holes with equal spacing between them. Ensure that you clean the shavings around the holes so that nothing can fall into the air intake passage way later. Now place the front piece back on the airbox and bolt entire assembly back into the vehicle. You have now greatly increased the amount of airflow though the airbox and no longer have the "silenced " sound when you mash the throttle down; just the sucking noise of a throttle body ingesting all the air it needs.