Join Date: Oct 2009
Location: Durand, IL
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They let the turbo breathe easier. If you do a 6637 filter it takes about 5 min to install once you get the airbox out. If I remember right the airbox is a little tricky to get out, it's been a few years though. Just a word of advise, stay away from K&N not a good filter.
97' F-250HD. ECLB. 66,000 miles. 7.3. E40D. 6637 Filter. 5" Exhaust. Deleted EBPV. CCV mod. 45 gal. Transferflow Rear Tank. Stock for now. Dana 60 in the works.
97' F-250HD. ECLB. 18x,xxx miles. 7.3. E40D. 6637 Filter. 4" Exhaust. TW Tunes. Work Truck.
97' F-250HD. ECLB. 150,000 miles. 7.3. E40D. 4" Exhaust. Work Truck.