In an effort to maintain parity the NHRA Technical Department will implement the following changes for the E3 Spark Plugs Pro Mod Drag Racing Series Presented by J&A Service at the Dodge Mile-High NHRA Nationals Presented by Pennzoil.  These changes will only be in effect during the Denver event.

• Supercharger and ProCharger entries maximum (numeric) rear-end gear ratio 5.00 -to- one.
• Roots Type Supercharger entries maximum supercharger overdrive limit is 20 percent.
• Turbocharger entries maximum boost pressure limit 31 psi.

Additionally parity adjustments may be made to any combination prior to any event as a result of our normal post-race parity review.