Fits like a glove

I replaced my stock air intake and filter system using this product. My 97 F250 Turbo Diesel has found new life , power, and fuel efficiency. After a dry, dusty summer it time for a replacement.

Perfect filter for the mod on my 7.3 at a way better price then local parts stores

Great filter, I have used these Donaldson Filters for years. Delivery was on time as always.

Item was just what I needed at a great price. Thank you

Works great, really makes the turbo scream

100 times better than stock. Stock air box and filter have the possibility of leaking around the filter. Easy to install the 6637 and sounds amazing too, remove stock air box and this will fill in the void perfectly. When buying this keep in mind that you need a 4 inch piece of tube to connect it to your turbo intake hose. I used 4 inch exhaust that was about 5 inch long. The filter seals perfectly around the material without clamps too.

Great product

Fits great, good upgrade over stock, wakes truck up,