The NEW office of EFI Performance LLC (TunedbyFrost) is located inside the (also new) Performance Auto Sport Shop at:
We have more late-model GM tuning experience in Central Virgina than anyone else. Many turbocharged/supercharged setups or other setups with large injectors are simply not safe to drive on a factory calibration or "tune". I am fully mobile and can drive to you to tune your car in the Richmond area for setups with larger than stock injectors. Travel tuning for groups is available as well.

My name is Steve Williams. I have been passionate about GM performance since before I could drive. I have tuned hundreds of setups. For years I was a Controls Engineer with previous focus on process and other analog and digital control systems. The mix of control engineering theory and automotive background marry nicely into tuning/PCM calibration. My background in electronics and controls allows me to fully understand and utilize the factory's sensors and I/O in the manner that allows for maximum driveability and of course horsepower! I have tuned a wide range of cars including stock, bolt-ons cars, cam, heads, max effort N/A, supercharged, and turbocharged. I employ a wide range of tuning approaches and have a nice deep bag of tricks. I can talk with you and work with you one-on-one with your project so that we can find the best [tuning] angle for your custom application. We are very proud of our Mail Order Tunes which are the result of years of dyno, street, and track testing. TunedbyFrost.com is the internet face of EFI Performance LLC.

I use HPTuners Pro and EFI Live
and a portable AFX or LM1 wideband for some applications