Introduction

The Precision Turbo Hellcat intercooler has rapidly become one of the most talked-about upgrades in the supercharged Mopar community. Owners of Dodge Challenger and Charger Hellcat models know that heat soak is the single biggest enemy of consistent performance. Once intake air temperatures climb, the engine management system pulls timing aggressively, and that 707 horsepower rating starts to feel more like a distant memory. Upgrading the factory intercooler is not just a nice-to-have—it's often the first serious modification recommended before or alongside any additional power adders like pulleys, tunes, or E85 conversions.

Precision Turbo & Engine, a name long respected in the forced induction world for its intercooler cores and turbocharger systems, engineered this replacement intercooler specifically for the Hellcat platform. The goal was simple: drop-in fitment with dramatically improved thermal management. This article provides a comprehensive look at the intercooler's dimensions, the installation procedure from a practical shop-floor perspective, and the real-world power results you can expect after bolting one in. Whether you are planning a full build or just want your Hellcat to pull hard lap after lap at the track, understanding what this intercooler delivers is essential.

Why the Stock Hellcat Intercooler Falls Short

Before diving into the Precision Turbo unit, it helps to understand the limitations of the factory intercooler. The stock intercooler on a Hellcat is an air-to-water (charge-air cooler) system integrated into the supercharger manifold. While it is adequate for stock power levels on a cool day, it is fundamentally undersized for sustained heavy throttle use. On a hot summer pass at the drag strip, intake air temperatures can climb past 140°F within a single run. Once temperatures exceed about 130°F, the PCM begins to pull ignition timing aggressively to protect the engine from detonation. This timing pull can cost 50 to 100 horsepower depending on conditions.

Additionally, the stock heat exchanger (the radiator-like unit mounted in front of the vehicle's condenser and radiator) is relatively thin and small. It simply cannot shed heat fast enough during back-to-back runs. An upgraded intercooler brick—the core that sits under the supercharger and handles the actual air-to-water heat transfer—directly addresses the root cause of heat soak. Larger internal volume, better fin density, and improved water flow paths allow the intercooler to absorb and reject more heat per unit of time. This is precisely the gap that Precision Turbo aimed to fill.

Precision Turbo Hellcat Intercooler: Size and Design Specifications

The Precision Turbo Hellcat intercooler is a direct replacement for the factory intercooler brick mounted between the supercharger housing and the intake manifold. It is not a front-mount intercooler or an auxiliary heat exchanger—it replaces the core internal to the supercharger system. This makes it a straightforward upgrade that does not require relocating any front-mounted components.

Core Dimensions

  • Core width: 28 inches (71.1 cm)
  • Core height: 10 inches (25.4 cm)
  • Core thickness: 4 inches (10.2 cm)
  • Overall width including end tanks: 32 inches (81.3 cm)
  • Inlet and outlet diameter: 3 inches (7.6 cm)

Compared to the stock intercooler, which measures approximately 26 inches wide, 8.5 inches tall, and 3 inches thick, the Precision Turbo unit offers a substantial increase in internal volume and frontal area. The additional inch of thickness alone represents roughly a 33 percent increase in core depth, which translates directly into more residence time for the charge air to transfer heat to the coolant. The wider and taller core also means more surface area for heat transfer across the entire operating range.

Core Construction and Materials

Precision Turbo uses a bar-and-plate core construction, which is widely regarded as superior to the factory tube-and-fin design for high-heat-load applications. Bar-and-plate cores have thicker internal walls and more robust fin packs that resist deformation under boost pressure. This construction also provides a greater number of cooling passages per square inch, allowing for more effective heat transfer between the charge air and the coolant. The end tanks are cast aluminum with smooth internal transitions to minimize flow restriction. The entire unit is TIG-welded and pressure-tested before shipping, ensuring it can handle the pressures generated by a modified Hellcat engine.

Inlet and Outlet Configuration

The 3-inch inlet and outlet ports are a significant upgrade over the stock 2.5-inch connections. Larger ports reduce flow velocity, which lowers pressure drop across the intercooler core. Lower pressure drop means the supercharger does not have to work as hard to push air through the system, resulting in a slight efficiency gain. This is especially beneficial at higher boost levels where even a few tenths of a psi of pressure drop can affect power output. For vehicles running larger throttle bodies or ported supercharger snouts, the increased port size also pairs well with larger intercooler bridge and heat exchanger lines.

Installation Process: A Detailed Walkthrough

Installing the Precision Turbo Hellcat intercooler is a project that most experienced DIY enthusiasts can complete in a weekend. The job is not technically difficult, but it requires patience, the right tools, and careful attention to detail. Some steps—especially removing the front bumper and working with the supercharger intercooler bridge—can be fiddly on a first attempt. Allow yourself six to eight hours for a first-time install, though experienced mechanics may complete it in three to four hours.

Tools and Supplies Needed

  • Metric socket set (8mm, 10mm, 13mm, 15mm, 18mm)
  • Torx socket set (T20, T25, T30, T40)
  • Flathead and Phillips screwdrivers
  • Trim removal tools for plastic clips
  • Torque wrench (capable of 15–30 lb-ft)
  • Intercooler bridge gasket set (new OEM or aftermarket)
  • New supercharger-to-intercooler gaskets
  • Coolant (OEM Mopar or equivalent for the intercooler circuit)
  • Shop rags, drain pan, and safety glasses
  • Optional: replacement intercooler bridge coolant lines (if original lines show wear)

Step 1: Preparation and Fluid Drain

Start by ensuring the vehicle is on level ground and the engine is cool. Disconnect the battery negative terminal. The intercooler system on the Hellcat uses its own separate coolant circuit, so you will need to drain that fluid before disconnecting any lines. Locate the intercooler reservoir tank (typically mounted near the passenger side of the engine bay) and drain the coolant into a clean container for reuse if it is relatively new, or discard it if it is old. Opening the bleeder screw on the intercooler bridge helps speed up the drain.

Step 2: Remove the Front Bumper Cover

Accessing the intercooler bridge and the lower fasteners on the heat exchanger requires removal of the front bumper cover. This is a straightforward process: remove the push-pin clips along the top edge of the bumper cover, the screws in the wheel well liners, and the fasteners under the lower lip. With all fasteners removed, carefully slide the bumper cover forward and set it aside on a soft surface. Do not force it—there are wiring connectors for the fog lights and sensors. Disconnect those as needed and hang the cover out of the way. Removing the bumper cover is the most time-consuming part of the job for beginners, but it grants excellent access to everything you need.

Step 3: Remove the Stock Intercooler

With the bumper cover off, you can access the intercooler bridge—the metal pipe that connects the intercooler brick to the front-mounted heat exchanger. Drain the intercooler circuit completely if you have not already. Disconnect the two coolant lines at the intercooler bridge using a 13mm or 15mm wrench depending on your vehicle year. Be prepared for residual coolant to drip; have rags handy.

Next, remove the supercharger inlet elbow and the air filter assembly to access the top of the intercooler brick. On the stock setup, the intercooler is sandwiched between the supercharger housing above and the intake manifold below. Remove the four bolts (typically Torx T40) that secure the supercharger to the intake manifold through the intercooler. Carefully lift the supercharger assembly slightly—just enough to slide the stock intercooler out. You do not need to fully remove the supercharger. Work the intercooler out from the rear, tilting it as needed. The factory unit is relatively light and should come out without excessive force.

Step 4: Prepare the Precision Turbo Intercooler

Before installation, inspect the Precision Turbo intercooler for any shipping debris or damage. The core fins are delicate; do not rest the unit on its finned surfaces. Clean the mating surfaces on the supercharger and intake manifold with a non-residue cleaner. Install the new gaskets provided with the intercooler or use fresh OEM gaskets. Do not reuse the old gaskets, as they will likely leak. Some installers apply a thin smear of high-temp silicone gasket maker to the gaskets for extra insurance, but this is generally not necessary if the surfaces are clean and the fasteners are torqued correctly.

Step 5: Install the New Intercooler

Position the Precision Turbo intercooler in the same location as the stock unit. The larger core means you will need to angle it carefully to clear the supercharger and intake manifold. Slide it in from the rear, just as the stock unit came out. Once in position, ensure the intercooler sits flat and the gaskets are aligned. Lower the supercharger back down onto the intercooler. Do not pinch the gaskets. Install the four bolts and torque them to the factory specification—typically 18 lb-ft (24 Nm). Over-tightening can distort the intercooler or supercharger housing. Check your service manual for the exact value for your model year.

Step 6: Reconnect the Intercooler Bridge and Coolant Lines

Reconnect the intercooler bridge to the intercooler outlet. The Precision Turbo intercooler uses the same 3-inch ports as the stock bridge on 2015–2023 Hellcat models, though some aftermarket bridge pipes may require slight modification for a perfect seal. Tighten the bridge clamps to 6–8 lb-ft. Reconnect the coolant lines to the bridge, using new O-rings if available. Refill the intercooler system with fresh coolant (Mopar OAT or a compatible coolant). Bleed the system by running the engine with the reservoir cap off and squeezing the lower radiator hose to purge air pockets. Top off the coolant as needed.

Step 7: Reassemble and Final Checks

Reinstall the air filter assembly, the supercharger inlet elbow, and all wiring harness clips. Reinstall the front bumper cover by reversing the removal process. Ensure all push-pins and screws are snug. Start the engine and let it idle. Check for any coolant leaks at the intercooler bridge connections and at the supercharger-to-intercooler interface. Test drive the vehicle briefly, then re-check the coolant level and top off if necessary. It is normal for the system to require a small amount of additional coolant after the first warm-up cycle as trapped air bleeds out.

Power Results: What Real-World Testing Shows

The primary reason for upgrading the intercooler is not peak horsepower on a perfect dyno pull—it is maintaining power when the heat is on. That said, dyno testing and track data confirm meaningful gains across the board.

Peak Power Gains on the Dyno

Multiple independent dyno tests have shown that the Precision Turbo Hellcat intercooler alone—without any other modifications—produces gains of 30 to 50 horsepower at the wheels on a stock Hellcat. The variation depends on starting intake air temperatures and ambient conditions. On a 90°F day, the gain tends to be at the higher end because the stock intercooler is struggling more. On a 60°F day, the gain is lower because the stock unit is already fairly effective. The true value of the upgrade reveals itself on repeated dyno pulls or track passes. On back-to-back pulls, a stock Hellcat can lose 30+ horsepower from heat soak between runs. The Precision Turbo intercooler holds power much more consistently, often within 5–10 horsepower across three successive pulls.

Torque Delivery and Response

Beyond peak numbers, the intercooler improves torque delivery across the entire RPM range. Cooler intake air allows the engine to maintain more aggressive ignition timing, especially in the mid-range where heat soak typically hits hardest. Drivers report a noticeably stronger pull from 3,000 to 5,500 RPM after the upgrade. Throttle response also sharpens because the supercharger does not have to overcome high intake air temperatures combined with reduced air density. The improvement is subtle but real—the car feels more willing to rev and builds boost more eagerly after a hard pull.

Intake Air Temperature Reduction

Data logging from owners confirms intake air temperature reductions of 30–50°F during sustained WOT runs compared to the stock intercooler under identical conditions. On a 70°F day, a stock Hellcat might see IATs rise from 90°F to 140°F during a 10-second pass. With the Precision Turbo intercooler, the same car might see IATs peak at 100–110°F. This 30–40°F reduction is the primary reason the engine retains timing and power. Even more impressive is recovery time—the intercooler sheds heat faster between runs, meaning that after a 30-second cooldown lap, the IATs are significantly lower than with the stock unit.

Consistency at the Drag Strip

For drag racers, consistency is king. The Precision Turbo intercooler shines in bracket racing and heads-up competition where repeatable passes are critical. Vehicles equipped with this intercooler typically see less than 0.1-second variation in ET between passes, compared to 0.2–0.3-second swings with the stock intercooler on warm days. The reduced IAT fluctuation means the engine management system does not have to constantly adjust timing, resulting in more predictable power delivery. For street driving, the upgrade translates to a vehicle that feels strong even after multiple hard accelerations in summer traffic.

Additional Considerations and Upgrades

The Precision Turbo intercooler works well on its own, but its effectiveness can be further enhanced with complementary upgrades. A larger front-mounted heat exchanger from brands like AFE, C&R, or Mishimoto increases the system's ability to reject heat from the intercooler loop. Upgraded coolant reservoir tanks with larger capacity also help. For vehicles running E85 or high-boost setups, an auxiliary intercooler pump (such as a Bosch 010 or EMP WP29) provides higher coolant flow through the intercooler brick, improving heat transfer further. Many serious racers combine the Precision Turbo intercooler with a three-pass heat exchanger and a high-flow pump for maximum thermal capacity. These additions are not strictly necessary for the intercooler to function well, but they unlock additional headroom for builds pushing 850+ wheel horsepower.

Why This Upgrade Matters

In the world of Hellcat performance, few modifications deliver as much consistent, real-world benefit as an upgraded intercooler brick. The Precision Turbo Hellcat intercooler is a thoughtfully engineered product that directly addresses the platform's most significant performance bottleneck: heat management. Its larger core, bar-and-plate construction, and 3-inch porting provide measurable improvements in power output, torque delivery, and thermal recovery. The installation is challenging but well within the reach of a determined DIYer, and the results are immediately noticeable both on the dyno and at the track. For any Hellcat owner looking to unlock the car's true potential without sacrificing drivability or reliability, this intercooler is a strong contender for the best first upgrade you can make.