Why Choose the AEM 21-5011 Universal CAI?
Because sometimes “stock location” just isn’t going to cut it.
The AEM 21-5011 gives you:
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High-flow mandrel-bent aluminum tubing
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AEM Dryflow filter — washable, reusable, no oil
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Gunmetal or polished look depending on variant
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Universal geometry so you can route it however your build demands
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A proven MAF-safe design you can pair with standalone ECUs or custom tuning
This setup is ideal for environments where heat soak kills performance, like engine bays with turbo kits, cramped swaps, or older platforms with limited aftermarket support.
The AEM 21-5011 Universal Air Intake Kit can be used in vehicles with an LS or Hemi engine. AEM’s 21-5011 is ideal for engine swaps when a custom intake is required.
Standout Features of the AEM 21-5011
🌀 Mandrel-Bent Aluminum Intake Tube
Smooth internal surface, zero bottlenecks, adaptable to many layouts.
🧼 AEM Dryflow Filter
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Washable
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Reusable
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Oil-free
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Filters extremely well without clogging your MAF
🔧 Universal Fitment Flexibility
Cut it, rotate it, reroute it — it’s basically intake Legos for adults.
❄ Designed for Cold-Air Placement
Engineered to be extended into lower, cooler air zones for maximum density.
It comes with an AEM Dryflow Air Filter, three 4 inch diameter aluminum tube bends, one straight 36 inch long, 4 inch diameter tube, seven couplers, a weld-on mass air flow sensor pad, two brackets and hardware needed to custom build an air intake.
Who This Intake System Is Perfect For
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Engine-swapped Civics, Integras, Miatas, 240SXs, etc.
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Custom turbo setups where factory piping doesn’t exist
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DIY builders who prefer tuning over “plug and play”
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Track cars needing cold-air placement far away from the engine
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Fabricators who want a reliable high-flow intake foundation
Basically: if you enjoy cutting aluminum pipe at midnight and calling it “progress,” this is your kit.
Performance Expectations
You won’t see “+12 HP on a 2008 Honda Something” here — it’s universal.
Your gains depend entirely on:
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Engine displacement
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Forced induction (or not)
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Intake routing
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MAF scaling/tuning
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Heat shielding
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Actual cold-air placement
Used correctly, the 21-5011 can dramatically improve throttle response, reduce intake temps, and support higher airflow for tuned or boosted engines.
Installation Notes (AKA: Your Fabrication Adventure)
Expect to:
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Mock up the tubing route
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Measure twice (you won’t, but pretending counts)
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Cut the aluminum tube to length
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Use silicone couplers to adapt to your throttle body or turbo inlet
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Mount the Dryflow filter in a cool air pocket
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Secure everything with clamps and brackets
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Tune if your setup requires MAF scaling
This isn’t “easy,” but that’s the point — you’re building something better than off-the-shelf.
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