Bought Riffraff Diesel 6637 Filter Kit 3 years ago and replaced the filter with a new Napa gold. BIG mistake run over a water puddle and sucked in the filter. The paper of the filter wiped out the turbo and plugged up the intercooler. Driving off road $2000.00. Fun in the dirt priceless.

Dropped right in 96 F350 crew without any problems. Already experienced better throttle response & mileage going to the same places as before. Idle has gotten slightly better.

Females mechanics should find the only extra tool they need is a ladder.

Just finished putting this on my stock 2002. Have not driven with it yet. I feel very confident in using the Donaldson filter and for $60 for the kit it’s a very good deal. I had to trim of the bottom of the old air filter base to get everything to fit under the hood. Only took a few minutes with a cutoff tool, no big deal. Was fairly simple to install. I only wish it would have came with instructions. As usual, parts were Riffraff quality (the best) and only reaffirms my habit of shopping Riffraff first.

This kit allowed the engine to breathe better and from the seat it feels like a slight improvement over the stock filter. Price was reasonable. Happy with the purchase.

I am looking for a some ways to improve my MPG on me F550 with a jib crane and I decided to give this a try. So far I have not seen an increase in mileage, but I have only run one take thru and it was on some really heavy hauling. The adapter tube was a little bit too long and the filter would not sit snugly in the engine bay. The hood closes down on it a bit. I think the adapter tube could be about 1 inch shorter and that would make it a better fit.

I wouldn't put anything but the Donaldson filter on my truck. Don't settle for napa or any of that crap. The price is right and the filter media is the best of the best.

I've just put this filter on my 2001 excursion, and so far it seems to be a great filter. I drive dirt roads a lot and it works well. I also have the cover for it so I can keep it cleaner longer.

I received what I ordered,put it in the truck definitely notice a difference, my truck didn't flatten out when getting up on the rpm,and less smoke.

Was looking for a decent filter setup without draining my bank and I just couldn’t beat 60 bucks or so for the kit really let’s my truck breathe.