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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 01-31-2013, 06:49 PM
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WTF!!! just got finished installing the 84mm fastman throttle body and everything was all good tell I try to put the K&N cai. back on. The neck is smaller then the throttle body way smaller!!
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Old 02-01-2013, 10:38 AM
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Should have bought the 87mm moes one. I did. Direct swap. Perfect fit!!
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Old 02-01-2013, 10:49 AM
Flaminchiten Flaminchiten is offline
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I thought I read somewhere that the 2012 throttle body was a little different or maybe it was the 2013, I would contact moes and see if they can give more information
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Old 02-01-2013, 11:03 AM
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Got the fastman cheap!!! So i'm happy with it, its the K&N cai that's the problem?
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Old 02-01-2013, 11:04 AM
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My vararam goes on my 87 like a glove.
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Old 02-01-2013, 12:58 PM
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Something isnt right. Both me and my buddy I have a 2011 and he has 2012 both have fast man throttle body and k&n cai no problems with fitment.
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Old 02-01-2013, 01:43 PM
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Your K&N neck aint smaller than your throttle body???
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Old 02-02-2013, 04:02 PM
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No we didn't notice any difference in size from stock to fastman?
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Old 02-02-2013, 08:52 PM
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Chris, how much undersized is the K&N collar?

Quote:
Originally Posted by Flaminchiten View Post
I thought I read somewhere that the 2012 throttle body was a little different or maybe it was the 2013, I would contact moes and see if they can give more information
The 2013 has a different TB, '05-'12 are the same on all the hemis whether it's a 5.7L, 6.1L, or 6.4L. The only difference between the '03/04 is it's a slightly different connector, but the mechanics are all identical.

Quote:
Originally Posted by cbrambo497 View Post
Should have bought the 87mm moes one. I did. Direct swap. Perfect fit!!
Both the Moes and Fastman TBs are OEM cores that are ported, the outside diameter is the same as the stock one he took off. The reason he went with the 84mm is because the mods he has will take advantage of the extra volume flow that an 80mm diameter butterfly TB can't flow.

The problem is with the K&N coupler, which is a simple fix. My old AirAid was a bastard to get over the TB neck, so I just measured the outside diameters of the inlet tube and TB and ordered a silicon expansion fitting that would match.
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Old 02-02-2013, 09:40 PM
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Thanks, that's what I did to day. order a specter 4" to 3.5" and im pretty sure this will fix it. I will have to cut some off the K&N cai. Its like the neck of the cai will almost fit in the throttle body. lol
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