INDYCAR will allow IZOD IndyCar Series teams to modify components to increase brake cooling on the 1.7-mile, 10-turn street circuit used for the Shell and Pennzoil Grand Prix of Houston presented by the Greater Houston Honda Dealers.

A bulletin issued to teams Sept. 12 permits trimming the front wing end plate wicker and modifying front and rear brake ducts and brake duct backing plates to increase rotor and caliper cooling. Both will be allowed with INDYCAR approval and are only for the Houston doubleheader weekend.

“Based on what we saw at Baltimore, where we saw the hottest temperatures of the year, and with hot temperatures expected again in Houston, we’ve decided to allow these changes to help teams improve cooling to the brakes, ” INDYCAR president of competition and operations Derrick Walker said.

The 90-lap races are scheduled for Oct. 5 and 6.