Riffraff Diesel: RDP 6637 Filter Kit - Ford Powerstroke Diesel Forum
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Old 10-03-2013, 07:16 PM
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Riffraff Diesel: RDP 6637 Filter Kit

I am interested in getting the Riffraff Diesel: RDP 6637 Filter Kit but would like to know how this differs from KN, SB etc besides the price. Also do cold air intakes improve gas mileage. A local guy I know has one and he doesn't think so. Finally will my truck be louder with a cold air intake no matter which one I would get. I am new to all of this so any advice is greatly appreciated.

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Mark
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Old 10-04-2013, 10:32 AM
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K&N is no good for diesel.
S&B is good for diesel but more expensive.
People do the 6637 cause it is inexpensive and still filters great. Also allows much more air in than the stock airbox.

You might be able to hear your turbo a bit more, maybe a slightly louder whistle but you wont notice a huge difference.

I put the 6637 on my rig and did a straight pipe at the same time and noticed about 1.5 more MPG.
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Old 10-04-2013, 01:25 PM
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the 6637 filters great and its cheap. and flow is improved.
put one on my dads truck and its not too much louder but it is a great upgrade.
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Old 10-04-2013, 02:42 PM
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I went with a bills custom intake. it made the turbo whistle louder and got rid of the stock air box. It depends on what your gonna end up doing with the truck. What goals do you have for it?
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Old 10-04-2013, 04:09 PM
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i dont think the filters that come with that intake filter very well.

the 6637 filter filters much better. and it flows plenty
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Old 10-04-2013, 05:08 PM
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Quote:
Originally Posted by blue99stroker View Post
i dont think the filters that come with that intake filter very well.

the 6637 filter filters much better. and it flows plenty

You get a choice of different filters, I haven't had a problem with mine yet. My boss has the 6637 on his truck and he likes it but its all stock. I have the riffraff billet wheel just ordered 250/200 injectors t-500 hpop valve springs, head studs I have a 4 inch straight pipe to 7 inch twin stacks. It all really depends on what the goals are for the truck I think
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Old 10-05-2013, 03:33 AM
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I have it on both of the trucks and it's great and looks pretty good under there with the cover as well.
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Old 10-06-2013, 12:06 PM
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I am actually just trying to get better performance and make my truck last longer. My wife and I also would eventually like to get a camper and be able to travel around the country with it. I may even sign on with a camper transport company and deliver new campers to surrounding states as well. My main goal was to improve MPG but if we get a camper that would be out of the question anyways. Any more advice is greatly appreciated.

Thanks
Mark
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Old 10-06-2013, 01:12 PM
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only thing wrong with the k/n-fipk kit, is the price. I'd stick with the 30 dollar 6637.
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Old 10-06-2013, 02:15 PM
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Just do what I did. Cheap, easy, and every bit as good as the fancy-pants expensive intakes.

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