Upgrading your Silverado 2.7 Turbo with the AFE Power Momentum GT Intercooler is one of the most effective ways to lower intake air temperatures, reduce turbo lag, and unlock consistent power under heavy load. The 2.7L L3B engine relies heavily on its charge air cooler to maintain performance when towing or in hot climates; the factory unit often becomes a bottleneck as boost levels rise. This complete installation guide covers every step from tool preparation to final test drive, ensuring a professional-grade installation in your garage.

Tools and Materials Needed

Before starting, gather the following items to avoid interruptions. The AFE Power Momentum GT Intercooler kit (part number 54-46802) includes all necessary mounting hardware, silicone couplers, and T-bolt clamps, but you will need standard shop tools.

  • Socket set – 10mm, 12mm, 14mm deep and shallow sockets
  • Ratchet and extension bars – 6” and 12” extensions
  • Torx bit set – T25 and T30 for grille and trim fasteners
  • Torque wrench – capable of 10–60 lb-ft
  • Flathead screwdriver – medium length for prying clips
  • Trim removal tools – plastic pry bars to avoid scratching paint
  • Heavy-duty trim clips (optional) – a few spares if originals break
  • Shop towels and degreaser – for cleaning mounting surfaces
  • Safety goggles and gloves
  • Coolant catch pan – only needed if you drain the charge air cooler system; the AFE kit does not require draining the engine coolant system
  • Jack and jack stands (optional) – helpful for accessing lower trim bolts

Preparation and Safety Steps

Proper preparation reduces the risk of damaging fragile plastic components and ensures the cooling system remains uncontaminated.

  • Park the Silverado on a level surface and engage the parking brake. Disconnect the negative battery terminal to prevent accidental airbag deployment or electrical shorts.
  • Allow the engine to cool completely – at least one hour if driven recently. The turbocharger and charge pipes can reach 300–400°F; contact with hot surfaces can cause serious burns.
  • Remove the engine cover (four push-pins) and the air intake resonator (two T25 bolts). This provides clearance to reach intercooler connections behind the passenger side headlight.
  • Photograph the factory hose routing and electrical connectors with your phone. This serves as a reference during reassembly.
  • Cover the front bumper and fenders with moving blankets or painter’s tape to prevent scratches when removing the grille and bumper cover.

Removing the Factory Intercooler

The factory intercooler on the Silverado 2.7T is sandwiched between the condenser and the grille. Removal requires patience – fasteners are often tight due to road grime.

Step 1 – Remove the Front Grille and Upper Trim

  • Open the hood and locate six Torx T25 screws along the top of the grille. Remove them and set aside.
  • Using a trim tool, release the eight spring-clips that secure the grille to the bumper cover. Pull the grille straight outward; it will separate from the bumper.
  • Disconnect the grille-mounted front camera harness (if equipped) by pressing the tab on the connector.

Step 2 – Unbolt the Bumper Cover

  • Remove the lower splash shield using a T25 Torx bit – typically eight screws along the bottom edge.
  • Locate the two push-pins near the tow hooks and two more behind the fog light housings. Remove all.
  • Carefully slide the bumper cover forward, supporting it with a ratchet strap or a second person to avoid stressing the side fender brackets.

Step 3 – Disconnect Charge Pipes and Electrical

  • Loosen the two 9mm worm-gear clamps at the intercooler inlet (driver side) and outlet (passenger side). Slide the silicone hoses back to expose the aluminum charge pipes.
  • Disconnect the charge air temperature sensor harness located on the passenger side outlet pipe. It uses a locking tab – press inward to release.
  • Unclip the two harness retainer brackets attached to the intercooler mounting flange.

Step 4 – Remove the Factory Intercooler

  • Support the intercooler with one hand, then remove the two 12mm bolts holding the lower mount to the crash bar and the single 12mm bolt at the upper bracket.
  • Twist the intercooler slightly downward and pull it forward through the opening. The factory unit is aluminum/plastic construction and weighs about 8 lbs – handle it gently to avoid bending the cooling fins.
  • Inspect the factory intercooler for signs of oil residue or debris inside the core. Light oil mist is normal (blow-by); heavy puddling may indicate a failing turbo seal and should be addressed before installing the new unit.

Installing the AFE Power Momentum GT Intercooler

The Momentum GT intercooler is a direct-fit replacement with a cast aluminum end tanks and a bar-and-plate core that offers 40% more internal volume than the stock unit. Follow these steps to ensure proper sealing and alignment.

Step 1 – Prepare the New Intercooler

  • Remove the mounting brackets from the factory intercooler and reinstall them onto the AFE unit using the supplied hardware. Torque the bracket bolts to 11 lb-ft (do not overtighten – the brackets are steel into aluminum).
  • Apply a thin film of silicone lubricant to the inside of the two supplied silicon couplers. This eases installation over the intercooler ports and charge pipes.

Step 2 – Position and Mount the Intercooler

  • Slide the AFE intercooler into place from the front, aligning the lower tabs with the crash bar holes. Install the two lower bolts and tighten to 16 lb-ft.
  • Install the upper mounting bolt (access through the factory intercooler bracket opening) and tighten to 16 lb-ft.
  • Double-check that the intercooler sits level and does not contact the condenser or radiator. If it touches, loosen the bracket bolts and shift the unit slightly – any vibration can wear a hole in the condenser over time.

Step 3 – Connect Charge Pipes and Sensor

  • Slide the supplied silicone couplers onto both intercooler ports. Install the T-bolt clamps but do not fully tighten yet – leave them loose so you can maneuver the charge pipes.
  • Reattach the charge air temperature sensor to the passenger side outlet pipe. Ensure the O-ring is seated correctly to avoid boost leaks.
  • Push the factory charge pipes into the couplers until they bottom out. Tighten the T-bolt clamps to 6–8 lb-ft (the torque spec printed on the clamps). Over-tightening can strip the T-bolt threads.
  • Reattach the two harness retainer clips to the intercooler bracket.

Step 4 – Reinstall Bumper Cover and Grille

  • Carefully guide the bumper cover back into position, ensuring the side tabs engage with the fender brackets. Secure the lower splash shield first, then the push-pins and screws.
  • Reconnect the front camera harness, then snap the grille into place. Install the six Torx screws along the top edge. Do not overtighten the screws – the plastic threads can strip.
  • Reinstall the engine cover and air intake resonator. Torque the resonator bolts to 4 lb-ft.

Post-Installation Checks and First Drive

After reassembly, perform these checks to confirm the system is leak-free and operating correctly.

  • Reboot electrical systems: Reconnect the negative battery terminal. Start the engine and let it idle for three minutes. The check engine light should remain off. If it illuminates, scan for codes – a P00E1 (boost pressure sensor) or P0101 (MAF) may indicate a disconnected sensor or massive boost leak.
  • Visual leak inspection: Listen for hissing sounds near the intercooler and charge pipe connections. Use a spray bottle with soapy water to mist the couplers while revving the engine to 2,500 RPM. Bubbles indicate a leak – tighten the clamps further (up to 10 lb-ft) or reseat the coupler.
  • Cooling system check: The AFE unit does not require coolant bleeding, but if you removed any coolant lines during bumper removal, bleed the cooling system per the factory procedure.
  • Test drive procedure: Drive the vehicle at varying loads – low-speed city, highway cruise, and a few full-throttle pulls in a safe location. Monitor intake air temperatures via the onboard throttle position display or a live OBD scanner. Under WOT, IATs should drop 15–20°F compared to the stock intercooler. If temperatures remain high, verify that the intercooler fans (if equipped) are functioning.

Performance Benefits and Long-Term Considerations

The Momentum GT intercooler provides measurable improvements that become especially apparent under sustained boost.

  • Lower intake air temperatures: The bar-and-plate core sheds heat faster than the stock tube-and-fin design. In summer towing conditions, IAT reductions of 25–30°F have been reported, reducing the ECU’s tendency to pull timing.
  • Reduced pressure drop: The larger core and streamlined end tanks allow charge air to flow with less restriction. The turbocharger does not need to work as hard to fill the intake tract, which can lower EGTs and improve turbo response.
  • Reliability improvement: The AFE unit is cast aluminum with welded brackets – no plastic end tanks to crack under heat cycles over 180°F. Many owners of tuned 2.7Ts consider this upgrade essential before increasing boost pressure above 25–27 psi.

If you plan to add a tune, the intercooler supports up to 450 hp without heat soak issues. Keep in mind that the factory radiator and fan clutch may need upgrading if you frequently tow in extreme temperatures – the extra intercooler volume adds a small restriction to airflow, but in practice most drivers see no difference in coolant temperature.

For more technical data, refer to the AFE Power product page for flow charts and dyno results. Installation discussions and owner feedback can be found on the SilveradoSierra 2.7T forum and a detailed AFE Power YouTube install walkthrough.

Final Thoughts

Installing the AFE Power Momentum GT Intercooler on a Silverado 2.7 Turbo is a rewarding project that delivers consistent power, safer IATs, and enhanced durability. The direct-fit design eliminates guesswork, and with careful attention to clamp torque and sensor connections, the installation can be completed in a weekend. Always verify boost leaks with a smoke test if available, and consider logging IAT data after 500 miles to confirm the core is fully seasoned. If you encounter any issues, reach out to AFE’s technical support line – they are responsive and knowledgeable about the L3B platform.