AEM Cold Air Intake System C.A.S.HONDA CIVIC SI 2.0L L4 02-05

AEM Cold Air Intake System C.A.S.HONDA CIVIC SI 2.0L L4 02-05

Marsoni

M251S

$175.00

Get it in 3 business days with 1 day shipping. Friday, May 29

AEM Cold Air Intake System C.A.S.HONDA CIVIC SI 2.0L L4 02-05The AEM 21 508R Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicle's restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno tested to fit specific Honda Civic SI models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is relocated to the driver side

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I was skeptical at first. How can such a quality performance air filter be so affordable? It fits perfectly and seems to perform and look exactly like the other name brand layered cotton gauze, steel meshed lifetime air filter. I sprayed some K&N oil on this thing and it feels like the engine is breathing a little easier now and performing a little better. As with anything new, your mileage will vary.

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Reviewed in the United States on October 19, 2025