Stainless and John, thanks for your responses/recommendations to my question. I might try verifying that the toe-in is minimal on the RX7. A note to John, my car is a first generation RX7 and doesn't have the IRS rear.
In 2010 I ran a closed Racing Beat racing exhaust system and stock fuel injection with an aftermarket cone air filter and reached 118 mph as a top speed. In 2011, I incorporated better breathing for the 13B, including the Racing Beat header in an open exhaust configuration, with a collector and 3" exhaust tubing out the rear of the vehicle. As you are aware, the exhaust note on an open RX7 exhaust is loud and obnoxious. I also ran the Racing Beat Holley 600 CFM 4 barrel carb/intake manifold kit and reached 122 mph as a top speed. In addition, I fabricated an aluminum air dam for the front of the car and installed aluminum skirting between the front and rear fender wells.
For 2012, I will be installing an aluminum flywheel which weighs about 13lbs. and is 12lbs. lighter than the stock flywheel. I will also remove the front air dam and block off the grill to try and clean up the front aerodynamics a little. The goal is to make the 130 Club in 2012. If I don't, I've got a 1990 Camaro that I will try in 2013.
If you have any other recommendations, they would be greatly appreciated.
Stainless and John, thanks again for your insights.
Russ