don't worry about changing your 6637 when it "looks" dirty. this filter can hold a lot of dirt before it starts to have restrictions.
here is a 6637 off of a ranch truck, I drove the truck 90 miles to my shop had full power and no black smoke. they would have kept running this filter a lot longer.
this truck sees almost only dirt and back country roads. the dirt is what came out tapping it on the floor about 10 times,
this is after I threw it out of the truck and kicked it out of the way a few times.
the new 6637 weighs 2 lbs 8.6 oz.
that dirty one weighed 2 lbs 14.4 oz
5.8 oz of dirt still in it! I probable knocked half that much out just handling it.
also the turbo blades from the truck that the filter in the pics was as shinny as a mirror, not a spec of dust on it.


<a href="http://s527.photobucket.com/albums/cc359/mrhelifixer/?action=view&amp;current=IMGP5213.jpg" target="_blank"><img src="http://i527.photobucket.com/albums/cc359/mrhelifixer/IMGP5213.jpg" border="0" alt="Photobucket"></a>

<a href="http://s527.photobucket.com/albums/cc359/mrhelifixer/?action=view&amp;current=IMGP5214.jpg" target="_blank"><img src="http://i527.photobucket.com/albums/cc359/mrhelifixer/IMGP5214.jpg" border="0" alt="Photobucket"></a>

 

Im also thinking about the DP F5 tuner. Can you put it on the truck safely bone stock with no mods or are there any risks with that?

 

: that is surely impressive. can't argue with that type of experience. thank you.

 

DP tunes work fine on a stock truck because the tunes will be for a stock truck.

You should at least get an EGT gauge so you know when to back off a bit.
You don't want the pistons to get too hot for too long.

 

I have the 6637 DIY intake. Very easy to do.
4in turbo back exhaust.
dp tuner
Thats all you need and youll love it, feels like a whole new truck over stock.
P.S. dont forget the egt gauge.