1999 air filter

[johnbeck]

I have a 1999 f250 7.3, built 6/98. It has a 3" thick carquest #88728 air filter. I'm considering buying the severe duty AIS filter assembly. What is the filter number for the AIS so I can compare side by side the size difference, and how significant is the difference in air flow? (I'm truly appreciative of the knowledge and advice I've gained from the members of this site). Thanks! Additionally, The California State Smog Monsters inspect everything associated with air and fuel. Has anyone in Ca who changed to the AIS had problems with it on the annual smog check? Thanks again!

[txgp17]

7.3L AIS Extended Life Filter Kit:
Ford Part Number - 2U2Z-9K635-AA
Motorcraft Part Number - FA-1759
Owners of vehicles built prior to December 7, 1998 [early 1999 MY], with fender air intake systems, will need to purchase “clean air hose XC3Z 9B959 AA.”

Replacement Filter:
Ford Part Number - 2U2Z-9601-BA
Motorcraft Part Number - FA-1757

[Rich D]

Rock Auto has the AIS kit for $176. Part # FA-1759 It's a huge air flow difference over the stock filter panel. I cant see how it would effect your emissions, it's a Ford part that they shouldn't even notice.

[JRNOLL]

I have the AIS it has the Ford logo on the cover and I have not had an issue with it and the smog people.

[johnbeck]

Thanks so much for providing all the part numbers and the Rock Auto price. Your help is extremely valuable. My 1999 F250 7.3 is stock other than 6.0 cooler. For towing, after the AIS, what's next? I'm thinking to replace the down pipe from the turbo, then the exhaust(Maybe 3 1/2 or 4" with a BTM) Once again, your opinions are truly appreciated. I love my 7.3 F250 and plan to keep it for quite some time!

[txgp17]

Originally Posted by johnbeck

For towing, after the AIS, what's next?

Opinions vary.
Were it me, I'd get an exhaust upgrade, from the turbo all the way out with 4". While in there, I'd consider getting rid of the Exhaust Back Pressure Valve (EBPV), and replace with a Garrett High Flow outlet. One poster here said that modification alone lowered his Exhaust Temperatures by 100º. That may require another pedestal. I say may because I'm not sure, the OEM EBPV is actuated by oil pressure. The oil supply would need to be addressed.

[INFRNL]

Originally Posted by txgp17

Opinions vary.
Were it me, I'd get an exhaust upgrade, from the turbo all the way out with 4". While in there, I'd consider getting rid of the Exhaust Back Pressure Valve (EBPV), and replace with a Garrett High Flow outlet. One poster here said that modification alone lowered his Exhaust Temperatures by 100º. That may require another pedestal. I say may because I'm not sure, the OEM EBPV is actuated by oil pressure. The oil supply would need to be addressed.

They have a pedistal without the EBPV, or many people gut out the original to eliminate it. I personally would just buy the pedistal w/o EBPV. I think current prices are abound $115

[Rich D]

Originally Posted by johnbeck

Thanks so much for providing all the part numbers and the Rock Auto price. Your help is extremely valuable. My 1999 F250 7.3 is stock other than 6.0 cooler. For towing, after the AIS, what's next? I'm thinking to replace the down pipe from the turbo, then the exhaust(Maybe 3 1/2 or 4" with a BTM) Once again, your opinions are truly appreciated. I love my 7.3 F250 and plan to keep it for quite some time!

I would say after the exhaust I would say get yourself a nice performance chip. No need to go high HP, but my 60hp chip setting from DP Tuner is a huge drivability upgrade and not going to kill anything with it.