1999 Super Duty
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Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
1999 Super Duty
I have a stock 2WD 7.3 Auto Super Duty. I tow about 10k. The truck has 114k on it. I am looking for small upgrades. Not interested in a chip but was thinking of adding one of those high flow air cleaners. But I was reading that a high flow air cleaner does not really start to work until over 3000 rpm. I generally run under 3000 rprm so, if this is true and I wasting my money. I was also thinking of a 4" exhaust at the same time. If anyone has done this or has input I would like to hear it.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Go to Clay at Riff Raff diesel, he as all the things you are looking for (and then some if you are interested.).
Riffraff Diesel: 99-03 Super Duty 7.3L
I like the 6637 air filter kit.
The filters are HUGE, having a large surface area, they will last a good long time before you have to replace it.
Riffraff Diesel: RDP 6637 Filter Kit
Exhaust: I love my 5 inch, great sound.
Riffraff Diesel: 99-03 Super Duty 7.3L
I like the 6637 air filter kit.
The filters are HUGE, having a large surface area, they will last a good long time before you have to replace it.
Riffraff Diesel: RDP 6637 Filter Kit
Exhaust: I love my 5 inch, great sound.
Laughing Gas
Joined: Aug 2009
Posts: 1,192
Likes: 7
From: Belgrade, MT
do it
I put a 4 inch mbrp from Riffraff and 6637 filter a year or so ago, money well spent, letting air in, and out, made the truck run a ton better, I have no clue what I picked up in HP/TQ numbers, but it was noticable. And that filter will last 3 or times what the factory setup will as it has a huge surface area as Dan mentioned. I am in a dusty environment here in the west, I change mine once a year because I am a bit **** on maint, but it would go alot longer with no problem.
Molon Labe
Joined: Dec 2006
Posts: 5,272
Likes: 1
From: Alaska
You can upgrade the radiator to the later style, and plumb in the cooler lines along with a better cooler.
A couple hundred buck can save you a few thousand down the road.
Senior User
Joined: Jun 2010
Posts: 362
Likes: 1
From: middlesex county, nj
I did the napa 6637 on my 99.5 cc,drw,....I can't say for certain, but it sure feels a bit crisper, I jump on it occasionally (!!!) and although it probably weighs around 8,000#....it jumps like a 5.0 stang, if I had some traction....it would be instant whiplash, there's a lot of performance hidden in these trucks, and this forum is the place to find it....my .02c
