I bought this and a pre-filter for my 01' cummins for the same price that napa was selling just the filter for. This is a huge improvement over the stock intake box and took a total of maybe 2 minutes to install. The intake hose slid right over the lip of this filter and clamped down snug. For the cummins owners wanting a cold air intake or maybe just a step up from stock, save yourself the money, this does the same thing at a fraction of the price with better filtration than you'd get from an oiled filter

Noticeable improvement from that junk K@N

I like using the 6637. It's much easier to change than factory, and I like knowing it has much more coverage area.

Ahhh air!

Great product and company to deal with.
But usps screwed me. I paid for 2 day shipping, took over a week to get it.

My 7.3 breathes like it should!

Fast shiping

Better than stock for sure and with a cover it lasts MANY times longer than a stock filter would

Product works as described