Welcome to P1-Underground Tuning
Built in the shop. Proven on the dyno. Felt on the street.
We specialize in custom tuning for Ford, GM, Chevy, and Dodge using SCT, HP Tuners, PCMtec, Holley and COBB.
From clean 93-octane NA builds to E85 conversions, boosted setups, ghost cams, and full multi-tune packages, we deliver real, proven results backed by dyno testing and real-world drivability.
In addition to tuning, we provide full diagnostics, live-data analysis, and data-log reviews to evaluate your current setup and ensure your vehicle is running exactly how it should.
We are a full service shop that also includes engine swaps, transmission swaps, engine rebuilds, and mechanical services.
Our brand-new shop in West Monroe, LA opens January 3rd!
Performance DynoTuning
P1-Underground Tuning is a full-service performance tuning and automotive shop located in West Monroe, Louisiana.
We specialize in custom tuning and performance upgrades for cars and trucks, backed by real-world experience and proven results.
Our services include dyno tuning and custom tunes using SCT, HP Tuners, PCMtec, Holley, and COBB, along with engine swaps, engine rebuilds, transmission swaps, and full mechanical services.
We also offer SCT, HP Tuners, and AVID devices on site, VP race fuels, and E85/X85 availability.
Operating from our new facility at 808 Jonesboro Rd, West Monroe, LA, our team is focused on delivering reliable performance and results you can feel on the dyno and on the street!
Just a few of our customers
“Marc Reimer, is the absolute best, he and Billy worked on tuning my 2022 Camaro SS. He was very personable, responsive and knowledgeable. I took my son along with me because he’s very much into cars and he absolutely loved every minute. Marc answered every single question I had and then some. They really woke my car up and will continue to do so as I keep adding parts! if you want your car to reach it's full potential go to P1-Tuners you won't regret it!
And as Marc said when I left let’s get you to 600hp. So be ready Marc I’ll be back after adding more parts.”
Michael Durham. (Facebook)