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Review on AEM 21 400C Metal Intake System by Hanson Kendrick

Revainrating 5 out of 5

True Claims! A real improvement!

I had one on my 89 Civic Si a few years ago and switched over for fear of water being sucked into the engine (this was before the relief valve). My car has all available bolts (intake, custom throttle body, manifold, exhaust, ECU, lightweight flywheel, stage 2 clutch, etc.) and this shot really brought the car to life. I especially felt more power at low to mid-rpm (where it matters most in the real world). I live in blustery South Florida so my next purchase will be a bypass valve in case I drive through a puddle.

Pros
  • Designed to increase horsepower and reduce restrictions over OEM intakes
Cons
  • Definitely a bad product