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JET Performance 28708S JET Stage 2 Computer Chips/Modules

JET Performance 28708S JET Stage 2 Computer Chips/Modules

$134.00
$134.00
Sale Sold out

JET Performance's JET Performance 28708S JET Stage 2 Computer Chips/Modules is a Stage 2 tuning module or chip calibrated for modified engines. Unlike a Stage 1 tune, the Stage 2 calibration assumes your vehicle has supporting modifications and adjusts fuel delivery, spark timing, and transmission behavior accordingly. This tuner is ideal for street-performance builds where every bit of tuned power counts. This unit is JET part number 28708.

Expect gains of 20-30 HP depending on your vehicle's modifications and engine platform. The Stage 2 tune is optimized for engines running aftermarket intakes and exhausts, with recalibrated fuel and ignition maps throughout the RPM range. Transmission tuning improves shift quality and timing for a more connected driving feel.

JET provides complete installation instructions with every Stage 2 unit. Chip-based applications require ECU removal and EPROM swap; module applications are plug-and-play. No laptop or tuning software is needed. The original factory tune can be restored by reinstalling the stock chip or module. Supporting modifications (intake, exhaust) are recommended for best results.

For a dyno-proven Stage 2 performance upgrade, the JET Performance JET Performance 28708S JET Stage 2 Computer Chips/Modules delivers the calibration your vehicle needs. Order yours today and experience what professional ECU tuning feels like.
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Frequently Asked Questions

How much horsepower will this JET Stage 2 computer module add to my vehicle?

The JET Performance 28708S JET Stage 2 Computer Chips/Modul typically delivers 25 to 45 horsepower and 30 to 50 lb-ft of torque for a noticeable seat-of-the-pants performance improvement. JET Stage 2 tuning is more aggressive than Stage 1 and requires the use of 91 octane or higher premium fuel to support the advanced timing and fuel maps. These substantial gains make this an ideal upgrade for enthusiasts who want maximum safe performance from their daily driver.

How long does it take to install this JET Stage 2 computer module at home?

Installing the JET Performance 28708S JET Stage 2 Computer Chips/Modul takes between 20 and 40 minutes depending on whether it is a module-style or chip-style unit for your application. Module versions plug directly into your vehicle's diagnostic link connector or engine sensor harness with no tools whatsoever required for the job. Chip versions require accessing the ECU and swapping the PROM, but detailed instructions and wiring diagrams are included with every unit.

Will this JET Stage 2 computer module leave any trace on my ECU or warranty?

The JET Performance 28708S JET Stage 2 Computer Chips/Modul leaves no permanent modifications on your vehicle and can be returned to completely stock configuration in just minutes. Module-style Stage 2 units simply unplug from the harness, while chip versions require reinstalling the original factory PROM into the ECU. JET specifically designs these calibrations to be invisible during routine dealer diagnostic scans so you can service your vehicle with confidence.

Does this JET Stage 2 computer module work with both gas and diesel engines?

The JET Performance 28708S JET Stage 2 Computer Chips/Modul is available for both gas and diesel engines, but each uses completely separate and distinct calibration strategies. Gas Stage 2 tuning requires 91 octane or higher fuel and focuses on timing advance and fuel curve optimization for maximum horsepower. Diesel tuning optimizes injection timing and turbo boost parameters for improved low-end torque, so confirm your engine type before ordering to ensure correct calibration.

How does fuel economy change with this JET Stage 2 computer module versus stock?

Fuel economy with the JET Performance 28708S JET Stage 2 Computer Chips/Modul varies because Stage 2 tuning is designed to prioritize maximum performance over fuel efficiency. Some drivers are able to maintain stock MPG figures during conservative cruising due to optimized part-throttle calibrations. However, the aggressive timing and fueling maps will decrease fuel economy under heavy throttle use, which is the trade-off for gaining 25 to 45 additional horsepower.

Will this JET Stage 2 computer module work well on a stock vehicle or need mods?

The JET Performance 28708S JET Stage 2 Computer Chips/Modul works well on stock vehicles but truly shines when paired with supporting modifications like cold air intakes and cat-back exhaust systems. JET strongly recommends using 91 octane or higher premium fuel to prevent engine knock and maintain optimal ignition timing advance. Stage 2 is best suited for enthusiasts who want maximum safe horsepower and torque from their daily driven vehicle.