Direct-injection, variable camshaft timing, forced induction … even with all the modern whiz-bang technology, internal combustion engines have been—from their invention—glorified air pumps. So, an increase in airflow will usually increase horsepower.
The latest Corvette Stingray is no exception. Its direct-injected Gen V small-block V-8 engine produces 460 horsepower and a like amount of torque. But the designers at Holley Performance Products in Bowling Green, Kentucky, still found some horsepower hidden in the intake system.
Holley’s latest addition to their new iNTECH cold-air intake lineup covers 2014-’17 Corvettes. It replaces everything from the throttle body to the fender, and features a unique, patent-pending “slip seal” air tube/filter/housing interface that eliminates troublesome clamps at this critical junction.
The system sports an OEM-like appearance that blends in nicely inside the Stingray’s engine compartment. The one-piece intake tube draws air through a high-flow, washable, four-layer performance air filter and connects to the throttle body with a flexible silicone coupling. All this adds 21 horsepower and 21 lb-ft of torque to the rear wheels. The gains aren’t just at the peak, but right across the meaty section of the powerband.
We visited Holley’s facility to witness the installation of their iNTECH cold-air intake on a C7 Stingray. Even stopping to take photos, the installation took about an hour. Twenty-one horsepower over a lunch break? We’ll take it! Vette
1. The Holley iNTECH cold-air intake is a direct replacement for the factory intake system. It includes a one-piece intake tube, filter housing, high-flow filter, clamps, detailed instructions, and all necessary fittings and hardware.
2. We began by removing the factory radiator duct to gain full access to the intake tube.
3. Next, we removed the PCV fittings from the OEM intake tube.
4. The last thing to be disconnected from the OEM intake tube was the mass airflow (MAF) sensor.
5. After loosening the hose clamps on both ends, we removed the OEM intake tube.
6. Then, we unscrewed the two fasteners from the filter housing cover and removed it from the engine compartment.
7. With the cover removed, the OEM paper air filter slid out.
8. To remove the stock filter housing, we unscrewed the fasteners and firmly pulled to disengage the rubber mounting grommets.
9. We compared the stock paper filter (left) to the conical Holley iNTECH four-layer, high-flow filter (right). Note that the sharp pleats in the paper filter greatly restrict flow, compared to the rounded pleats on the Holley filter.
10. With the stock intake system completely removed, we transferred the rubber isolation grommets from the stock filter housing to the Holley iNTECH filter housing.
11. Next, we removed the MAF sensor from the OEM filter hosing cover.
12. Using the supplied screws, we installed the MAF sensor into the Holley iNTECH cold-air intake tube.
13. Then, we installed the supplied PCV fittings into the Holley iNTECH cold-air intake tube.
14. Next, we installed the Holley iNTECH air filter housing to the inner fender of the Corvette using the factory mounting points and the supplied hardware.
15. After placing a clamp over one end of the included silicone coupler, we slid the coupler over the throttle body’s sealing flange.
16. Next, we installed the filter over the intake tube.
17. Note how the air filter, intake tube and air filter housing fit together without any clamps!
18. Then, we installed the intake tube into the silicone coupler and sealed it with the supplied clamp.
19. Next, we reconnected the MAF sensor.
20. Then, we reinstalled the PCV lines. Note that the Holley iNTECH system includes an anti-resonance chamber to cancel out annoying intake drone.
21. We finished the installation by reattaching the radiator duct.
22. The Holley iNTECH cold-air intake blends in perfectly to the engine compartment of this Stingray. Heck, we think it looks better than the stock system.
23. Not only does the Holley iNTECH cold-air intake system look better than the stock system—it performs better, too. It added as much as 21 horsepower and 21 lb-ft of torque across a wide range on this Corvette. Impressive.
Photos by Wes Duenkel