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Welcome to LT1 TUNER

Your source for precision GM tuning.

My passion for tuning began in 1995 when I bought the Trans Am I still own today. At that time, tuning support for Gen 2 LT1s was nearly nonexistent—until LT1 Edit emerged in 1998. Since then, I’ve followed every advancement in GM tuning software and datalogging tools, growing with the technology and learning through real-world experience.

Today, LT1 TUNER offers custom calibrations for Gen 2 LT1s through Gen 5 platforms—covering street builds, race cars, and everything in between. Whether you’re looking for a remote tune, mail-order service, or help dialing in a boosted combo, I’m here to deliver proven results and reliable support.

Featured Builds

1995 Black Camaro Z28

1995 Black Camaro Z28
Gen 2 LT1, custom turbo setup, tuned for street and strip.

1995 White Trans Am

1995 White Trans Am
My original car—owned since new and still going strong.

Contact Information

Email: performancess@cox.net

Messenger: Message Steve Devillier on Facebook

Business Hours

Please do not message late at night or on weekends. Feel free to send an email anytime, and I’ll respond as soon as possible during regular business hours.