The Best Silverado Cold Air Intake: The NAP Review
We are not the oldest guys in the room. But carburetors, flat-tappet cams, and classic muscle have been the center of our automotive world since before we were old enough to drive one. That background shapes what we pay attention to. It shapes what earns our respect. When we came across this Silverado cold air intake from North American Performance, that round steel lid and open element filter grabbed us immediately. It looked like something that belonged on top of a Rochester four-barrel in 1969, not sitting inside a modern truck engine bay. For a brand built on old school car culture, that design language means something. So we wanted to find out whether the engineering behind it matched the aesthetic.
Table of contents
- Why The Big Three Never Let Them Build What They Wanted
- What The OEM Airflow Path Actually Looks Like
- The Dyno Numbers Behind The NAP Silverado Cold Air Intake
- How NAP Tuned The Induction Sound
- Why The Round Steel Lid Is Not A Gimmick
- Why The Materials On This Silverado Cold Air Intake Matter
- Who Should Run This Intake
- Frequently Asked Questions
We reached out to North American Performance and interviewed Cole Schaenzer, their Engineering Manager, to get the full story. What came back was not what we expected from an air intake company.
These are not guys who stumbled into air filter design. Their parent company, North American Assembly, has been building cold air intake systems as a Tier 1 supplier to GM, Ford, and Chrysler for over 20 years. They have manufactured more than 65,000 CAI assemblies for the Big Three. Nine consecutive GM Quality awards. Stellantis Supplier of the Year. Those credentials matter. They explain exactly why this Silverado cold air intake is different, and why it took a group of engineers going out on their own to finally build the product they always wanted to make.
Why The Big Three Never Let Them Build What They Wanted
The corporate intake design process has nothing to do with performance. Schaenzer was direct: “When working with the large manufacturers, they have a standardized process and final say in all designs. These decisions are not always based on performance or pushing the envelope for design, but fitting within their brand.”
The most telling detail from the whole interview was this one. North American Assembly designed intake systems with gains so significant that the vehicles would have required a dealer flash to recalibrate the ECU. The OEM said no. Scale it back. They did, because that is how the contract works.
Spend decades doing that, and you start to see what performance looks like when nobody pumps the brakes. That is what NAP is.
What The OEM Airflow Path Actually Looks Like
Most people think of an air intake as the box, the tube, and the filter. That is the last third of the story. The full airflow path on a stock GM truck runs nearly eight feet from outside air to the throttle body. It is not a straight run either. Eight 90-degree turns, baffles, resonators, and enough restriction to make the engine work harder than it should just to breathe.
The aftermarket answer has always been the same. Address the final three feet, swap the box and tube for something freer-flowing, and call it done. Those companies are not lying when they show dyno numbers. That last section does matter. But the OEM path upstream limits how much their system can actually deliver.
NAP asked a different question. What if you eliminated the whole problem section entirely?
Their Silverado cold air intake cuts the airflow path from nearly eight feet down to 32 inches. One 90-degree turn and one 45-degree turn, total. That is the engineering story behind the numbers.
The Dyno Numbers Behind The NAP Silverado Cold Air Intake
The NAP system pulls 46% more airflow than stock on the 6.2L, with 30-plus CFM gains at wide open throttle. Those numbers come from a SuperFlow flow bench. They are not marketing estimates.
Dyno testing ran at Prefix in Auburn Hills, Michigan, on a Dynojet 224XLC. Prefix handles chassis development on serious track vehicles. Testing showed horsepower and torque gains with no tune and no ECU modifications. NAP makes that point deliberately. Many aftermarket dyno numbers include a tune, which makes it impossible to isolate what the intake itself actually contributes.
Schaenzer made another point worth repeating. “Most aftermarket companies advertise numbers with the 5.3L vs the 6.2L, obviously for a reason.” The 5.3 produces bigger headline numbers in testing because the 6.2 already runs a stronger factory tune. NAP tested the 6.2 first. They are still searching for a 2019-2021 5.3L for controlled dyno conditions and are offering a complete system to any local owner willing to participate in the testing.
That kind of transparency is rare in this market.
How NAP Tuned The Induction Sound
OEMs add resonators to reduce induction sound. NVH testing requires it. Those resonators also add restriction, because the engineering priority is a quiet cabin, not a responsive throttle.
NAP never considered resonators. Schaenzer put it plainly: “We don’t remove the resonator and baffles; we never consider them from the beginning.”
They ran 3D-printed iterations to maximize both airflow and sound. The system stays quiet at cruise and gets loud when you get into the throttle. Acoustic ports on the rear of the intake direct that sound toward the driver. The tunable port plugs let you decide how much you want. Pull them for maximum induction noise. Leave them in for a more controlled note. The NAP team runs their personal trucks with the ports open. As Schaenzer told us: “We love the sound on the truck, it’s quiet when cruising and aggressive when you punch it.”
One note they addressed directly from online comments: do not try to flip the lid like the old-school air cleaner trick. The hood will not shut.
Why The Round Steel Lid Is Not A Gimmick
The steel lid grabbed us first. Once you understand where it came from, it means even more. It did not come from a marketing meeting. It came from early design sessions where the NAP engineering team referenced the old habit of flipping the air cleaner lid to open up induction sound. Schaenzer told us that many of the older engineers “remember flipping the cover to get that whooshing sound and back to Cubic Inches, not liters.” The round lid was part of the concept from day one.
Those of us who have built and tuned carbureted engines know exactly what that reference means. It is the same spirit that put a chrome air cleaner on top of a Holley double pumper and made the whole engine bay look like it meant business. NAP captured that feeling without sacrificing any of the engineering underneath it.
Colors are available at no extra charge, chosen by team vote. Custom prismatic colors are also available, and NAP has already shipped custom-color units to customers who asked. Schaenzer confirmed the feedback loop on colors stays active and open.
The 5.3L version carries a “327” callout rather than the technically correct “325,” because the 327 cubic inch small block Chevy carries real American performance heritage. They did it on purpose. A “325” version is coming for anyone who insists on accuracy.
Why The Materials On This Silverado Cold Air Intake Matter
The NAP system uses 30% glass-filled nylon, injection molded. Intake manifolds use the same class of material for the same reasons: it handles thermal cycling without dimensional drift and survives backfire pressures without cracking. Schaenzer was direct: “Injection molding is repeatable to the thousandths of an inch, whereas rotary molding is plus or minus a quarter inch. The 30% glass filled nylon injection is magnitudes stronger, 4 times the price, and has zero impact from thermal cycling. Intake manifolds are made out of GF nylons to handle 100 psi backfires. Poly is for toys.”
Anyone who has fought an aftermarket intake that did not seat correctly already understands why dimensional consistency matters. The NAP system fits like an OEM part because its builders have been hitting OEM tolerances for over two decades.
The million-mile warranty backs all of it. North American Assembly has shipped 30,000 Dodge Challenger Shaker assemblies without a single return. Their IATF19649 certification is the same standard that any production vehicle supplier must meet. As Schaenzer put it: “10 years from now our product will have the same properties as it was molded.”
Who Should Run This Intake
The NAP Silverado cold air intake fits 2019-2026 Chevrolet Silverado and GMC Sierra with the 5.3L or 6.2L V8. Expansion into other GM and Ford truck platforms is in development, with customer feedback shaping which vehicle comes next.
We came to this product as people who care about old school design done right, who spent years learning carbureted engines and classic builds from the ground up. That background makes it harder for us to be impressed with nostalgia alone. What NAP built here is the real thing. It looks the part and backs it up with engineering that goes deeper than anything else currently in the Silverado cold air intake market.
If you run a 5.3 or 6.2 truck and want real performance gains without a tune, this is the intake worth looking at.
If the NAP intake got you thinking about air movement and what your engine is leaving on the table, we have more for you. Check out our breakdown of the BTR Trinity Tunnel Ram and why it might be the base every serious build should start from: BTR Trinity Tunnel Ram: One Base, Every Build
Frequently Asked Questions
No. NAP designed the system to deliver horsepower and torque gains on the 5.3L and 6.2L without any ECU modifications or tuning required.
The NAP system currently fits 2019-2026 Chevrolet Silverado and GMC Sierra equipped with the 5.3L or 6.2L V8 engine.
NAP’s system pulls 46% more airflow than the factory setup on the 6.2L, with 30-plus CFM gains measured at wide open throttle on a SuperFlow flow bench.
Yes. The system includes tunable acoustic port plugs. Remove them for maximum induction noise at wide open throttle, or leave them in for a more subdued sound profile at cruise.
Most aftermarket intakes only replace the final three feet of the stock airflow path. The NAP system eliminates the entire factory path and reduces it from nearly eight feet down to 32 inches, with just two bends total versus eight 90-degree turns from the factory.
