I have a 98 Expedition. Which of the two is the best? Thanks!

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I believe both are equal in benefits and price. However, only the K&N is emissions certified. I'd go with the K&N FIPK.

 

I just installed the Airaid. Although they haven't gone through the emisions cetification, I agree, it and the K&N give you the same performance for the same money. The reason I went with the Airaid was looks and fit. I'm sure the K&N fits well, but the Airaid has an aluminum tube that looks nicer and the thing mounts very solid. I've also heard many people with K&N mention how loud it is. I think the Airaid, maybe because of the heavier aluminum tube, may be quieter. I only notice it under hard throttle and it sounds very mellow, like the secondaries opening up on a quiet 4bbl.

Keep in mind also, they both use a K&N filter.

Airforce 1 is emisions certified (as of Jan 2001 anyway), it looks really pretty and costs about $30-$40 more. Check all 3 out on the Online Store here at F150online.

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2000 Expedition Eddie Bauer 4x2
Estate Green
5.4 ltr
3:55 LS rear
Tow Package
Superchip
Airaid FIPK
Rear Load Leveling
Moonroof
Century Child Seat!

 

Thanks guys! I guess I'll go with the K&N. I can get it for $159 shipped at carparts.com with the 33% off coupon. (coupon # 1963005)