$595.00 USD
$595.00 USD








The JB4PRO is the most advanced plug & play performance tuner available for the 2025+ C8 Corvette ZR1 with the twin-turbo 5.5L LT7 engine. Expect gains of up to 100whp peak and 220whp under the curve on high-octane fuel while keeping your factory ECU completely intact.
The JB4PRO intercepts sensor signals and CANbus data to dynamically optimize boost, timing, and air/fuel ratio for safe, smooth, and massive power increases. No ECU unlock or flashing required — simply plug it in and transform your ZR1.
Up to +100whp peak and +220whp under the curve on high octane fuel. Dramatically improved 0-60 and quarter-mile times.
Change maps on the fly, boost by gear, data logging, gauge monitoring, code reading/deleting, and performance estimates — all from your iOS or Android phone.
Preloaded maps for 91+ pump gas, race gas mixes, straight race gas, and up to 30% E85 blends. Factory bypass map included.
Installs in minutes using easy-to-reach connections in the engine bay and OBDII port. No wiring cutting or permanent modifications.
Backed by a full 5-year warranty. Not VIN locked — easily removable and transferable or resale-ready.
Limit boost in 1st, 2nd, and 3rd gear via the app for perfect traction and launches.
| Compatibility | 2025+ Chevrolet Corvette C8 ZR1 (LT7 5.5L twin-turbo V8) |
|---|---|
| Power Gains | Up to 100whp peak / 220whp under the curve (high octane) |
| Fuel Requirement | 91 octane minimum for performance gains |
| Installation | Plug & Play – engine bay + OBDII |
| App Support | Free JB4PRO iOS & Android app (Bluetooth) |
| Warranty | 5 Years |
| Origin | Designed and assembled in the USA |
Unlike traditional flash tunes, the JB4PRO leaves your factory ECU untouched and fully functional. You retain all OEM safety systems, drivability, and the ability to return the car to stock in minutes. The system is constantly improved with free firmware and map updates directly through the JB4PRO app.
Perfect for daily driving, track days, or all-out performance — the JB4PRO delivers supercar power while remaining completely reversible and safe.
Yes — it is a true performance tuner. It actively modifies boost, timing, and AFR in real time using advanced CANbus integration and multiple sensor inputs.
Most customers complete the install in under 15 minutes using basic hand tools.
The JB4PRO is fully removable with no trace left behind, making it one of the safest tuning options available.
Yes — the JB4PRO works great with intakes, exhausts, and other bolt-on modifications.
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$595.00 USD
$595.00 USD
This product can expose you to chemicals such as lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
For a complete list of chemicals known to cause harm, visit https://www.p65warnings.ca.gov/chemicals.
Under the federal Clean Air Act (42 U.S.C. §7522(a)(3)), it is illegal to manufacture, sell, install, or use any part that defeats or alters a motor vehicle’s emission control system for use on public roads. Unless a product has received an Executive Order (EO) from the California Air Resources Board (CARB), it is not legal for use or installation on any pollution-controlled vehicle driven on public highways.
Some states have CARB-equivalent or independent emissions laws. Customers are responsible for verifying local regulations before purchasing or installing emissions-related products.
All performance, racing, or competition parts sold by this company are intended solely for off-road, closed-course, or competition use on vehicles that are never registered or used on public highways.
Kies Motorsports, LLC sells and markets these products for lawful use only. We do not condone or authorize the use of emission-control defeat devices or any modification that violates the Clean Air Act or state regulations.