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aFe Magnum Force Cold Air Intake - 51-81174

Stage-2 Sealed Intake System
  • $380.05
  • Free Shipping
  • Ships Between 4/24 - 4/26
  • What Do You Drive?


  • Style:
    With black housing cover, with Pro Dry S Filter (grey)
  • Part #:
  • Estimated power gains: 19 hp and 27 ft. lbs. torque
  • Black powder coated airbox
  • Includes aFe's oil-free filter, synthetic media requires no oil and is easy to service (Grey)

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aFe Magnum Force Cold Air Intake Part #51-81174 Customer Reviews

Average Rating

8 Customer Reviews

Afe tundra 5.7

Reviewed by Scott S (WILSON, WY) Reviewed for a 2017 Toyota Tundra — Nov 27, 2017 6:17 AM

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This intake looks and sounds great! Installation was not a complete breeze but I'm not the most handy. For the mechanically inclined probably have it done in an hour tops. Why I didn't give it a higher over all is the loss of mid range power. Better throttle response and top end. Felt I lost a lil in that important 2200-4000 range. As far as Auto Anything goes I will not shop anywhere else from now on.

A decent CAI for the price

Reviewed by Chris S (Ft. Collins, CO) Reviewed for a 2014 Toyota Tundra — Oct 03, 2017 4:54 PM

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I've installed & used many different CAI(s), including OEM. This aFe CAI was fairly priced compared to other closed system CAI(s). The install was not as smooth as I hoped. Had to use some force to connect the tube between the filter box & the throttle intake. The filter box only used 2 of the original 3 anchor points. However, with the tightly fitting tube between the filter box & throttle intake, it doesn't move much. Once installed, it looks good & performs as expected.

Good deal

Reviewed by zlatko p (SALT LAKE CITY, UT) Reviewed for a 2013 Toyota Tundra — Feb 09, 2016 5:14 AM

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Installation was somewhat simple. Quality was OK, could be better. It's not OEM fit. Rubber seal that goes to the fender was tight if you mount it to the box instead of a fender. Cover should really have 6 mounting points ( cover bows up with 4). Check vacuum holes because there there was plastic left inaide due to molding process. No performance data yet. Great sound though

Toyota Tundra Crew Max

Reviewed by Rodney G (BRONWOOD, GA) Reviewed for a 2011 Toyota Tundra — Sep 09, 2015 12:40 PM

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This is a well made system for the Toyota Tundra. I have had two K&N cold air system with both of them turning my check engine light on, saying I had a bad mass air flow sensor. If you have a Tundra and want more power and torque go with AFE, its price a little higher than K&N but well worth it.

2007 tundra 5.7

Reviewed by Durrell C (NORTH LAS VEGAS, NV) Reviewed for a 2007 Toyota Tundra — Jul 21, 2015 8:05 PM

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Looks and sounds great. You can actually feel the gains in HP when you romp on it. Gas mileage has improved 1-2 mi per gal. Highly recommend over others.

Needs Better Instructions

Reviewed by KEVIN M (KATY, TX) Reviewed for a 2007 Toyota Tundra — Jan 03, 2015 7:24 AM

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1 of 1 people found the following review helpful.

Decent quality. Instructions are lacking. Be careful threading the bolts into the MAF housing. Easy to cross thread if not careful. There is a 14" piece of weather striping. Instructions do not tell you were to put it but it goes on the intake side inlet that fits into the passenger side quarter panel to seal the intake tube into the filter. It's not the best design. It should have been molded to fit instead of trying to make it fit by hand.

2nd aFe CAI

Reviewed by Daniel D (Yorktown, VA) Reviewed for a 2015 Toyota Tundra — Nov 03, 2014 3:21 AM

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1 of 1 people found the following review helpful.

As the title suggests, this is my second aFe Magnum Force CAI. I had a good experience with the previous CAI on my 2011 Tundra, so when I upgraded my truck to a 2015, I decided to stick with aFe again. Good fit (although it does rub on the engine cover), good finish, and an overall good looking product. The instructions still lack a bit, but anyone with decent mechanical sense can work through it.


Reviewed by Lucas W (SAN ANTONIO, TX) Reviewed for a 2007 Toyota Tundra — Jun 03, 2014 9:53 AM

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1 of 1 people found the following review helpful.

This intake is awesome. I got it professionally installed when I leveled my Tundra but overall it is great. Sounds throaty when you step on the gas but quite when I'm coasting, just what I wanted. I've only had it for about a month but so far I'm getting about .5 mpg better, which hey, when I was only getting 14-15 mpg anyways I'll take anything I can get. Overall, great product and I will definitely recommend to anyone. Shipped next day and the customer service was great!