What exactly does the 6637 mod do?

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Mar 29, 2010 | 04:11 AM

#16

tjc transport

i ain't rite

Joined: Mar 2005

Posts: 65,586

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From: Marlboro Mental Hospital.

Quote:

Originally Posted by Kwikkordead

It looks like load reduction relays for a plow or winch or lights.

yup. relays and circuit breakers for the lightbar, work lights, air compressors, and strobe lights

Mar 29, 2010 | 07:21 AM

#17

mechelement

Cargo Master

Joined: Oct 2008

Posts: 3,330

Likes: 13

From: Eaton, CO

My 6637 install caused turbo surge when pulling 7% grade when empty. VERY BENEFICIAL!!!!!!!!!!!!!!!

Mar 29, 2010 | 07:36 AM

#18

Robert6401

Cargo Master

Joined: Feb 2005

Posts: 2,837

Likes: 1

Question guys, I have had the 6637 on my truck pretty much since I got it. Long enough to not remember what the truck runs like without it. My question is, is the engine quieter with the stock airbox and filter? Mine seems to have a moan or drone that my father-in-law's doesn't, but he still has the stock setup.

Thanks.

Mar 29, 2010 | 07:46 AM

#19

mechelement

Cargo Master

Joined: Oct 2008

Posts: 3,330

Likes: 13

From: Eaton, CO

The engine isn't quieter, but your cab is. With the 6637 I only get a drone at certain RPMs in a certain gear and constant at those for a bit. Thankfully no drone at 65mph. Supposedly if you make an airbox surround for your 6637, the drone goes away. You'll hear more turbo noises with the 6637 too. That's just the way an open air filter goes.

Mar 29, 2010 | 08:15 AM

#20

TRL WGN 1

Freshman User

Joined: Mar 2009

Posts: 49

Likes: 0

Quote:

Originally Posted by SpringerPop

I believe that restriction differential is restriction differential, regardless of the size of the medium.

On what did you base your decisions to change the filters?

Reduced fuel economy?

Dirty appearance of the filter?

Restriction differential?

Pop

On my SD, I changed the filter on appearance-it was absolutely the nastiest looking air filter I have EVER seen in a running vehicle, when I bought it. The filter minder was still in the green. On my Yukon, the filter didn't look as bad as the SD, but was still VERY dirty, but yet the filter minder was green on it as well.

This is just my experience with them. Maybe I have never been around a filter minder that was actually working properly?

However, what I am saying is, if you are wanting more airflow, would you want to wait until the airflow is restricted below the factory amount, before changing your 6637?