I have headers on my 426 Hemi and the intake tube holes on the intake are wide open. Should I purchase the block off plates for any reason? The car is only driven during good weather conditions.

Do you know if your intake manifold has holes burnt through it(from the ehxhaust) on the inside of the motor side under the oil splash plate sheild? If no holes you don't need it, if it has holes burnt thruogh it you really need to block those holes off the keep dirt and other garbage out of your motor