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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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  #11  
Old 02-02-2013, 10:31 PM
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I'm confused. If the fastman TB is the same OD as your original, and your K&N fit your original, why doesn't it fit the fastman?
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  #12  
Old 02-02-2013, 10:41 PM
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Actually, Chris, do you know if it's an Fastman 847 or the 801. The 847 used a different OEM cast compared to the 801, it had a thicker neck. Mother Chrysler decided to make 2 different castings on several models/years across the board, and normally isn't an issue because the stock air box coupler has a lot of play in it. The 801 should have what looks like a machined ring but the 847 should just be a solid outside circumference. The easiest way to tell is the 847 has a ridge along the bottom of the TB but the 801 doesn't.

I bet that's what the issue is. When you order them directly from fastman he makes you look at what TB you have and you'll get an exact match.
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Last edited by CdnoilRAM; 02-02-2013 at 10:45 PM.
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  #13  
Old 02-03-2013, 02:13 AM
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That's sounds about right. I got it used from someone on here. My stock throttle body had a lip where the cai goes on but this one does not. So is this bad??? do i have the wrong throttle body?
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  #14  
Old 02-03-2013, 09:11 PM
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The throttle body internals are the same, the only difference is the outer lip. The coupler should work for you, I just worry that 4" is a little too big.
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  #15  
Old 02-03-2013, 09:32 PM
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Well I ordered the spectre 4" to 3.5" but it has a insert so it can be
used as 3.75" to 3.50"
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  #16  
Old 02-03-2013, 09:42 PM
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You should be good if it's got the insert.
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  #17  
Old 02-03-2013, 09:46 PM
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honestly now that I've looked at it better I think I just had the clamps in the wrong place and maybe over tighten one of them. lol but the blue spectre is going to look better anyway.
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  #18  
Old 02-07-2013, 04:20 PM
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Quote:
Originally Posted by CdnoilRAM View Post
You should be good if it's got the insert.
Here's the fix for now. Cut about 2" off the K&N cai tube and put the spectre 4" to 3.5" on top of the 84mm fastman.
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  #19  
Old 02-07-2013, 05:13 PM
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Looks nice and clean

Your engine bay is a prime candidate for some Billet-Crack... I mean Billet Tech stuff
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  #20  
Old 02-07-2013, 05:24 PM
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Quote:
Originally Posted by CdnoilRAM View Post
Looks nice and clean

Your engine bay is a prime candidate for some Billet-Crack... I mean Billet Tech stuff
I've got there blue catch-can. and I wanting the rest but kinda waiting on this sale I keep hearing about 40% off.
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