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Aside from full-throttle operation at the dragstrip, there is very little to be gained with an aftermarket intake system on a gasoline engine. Under normal operation, like 25% throttle or so, your throttle restricts the airflow FAR more than the intake system..... to the point that any reduction in intake restriction would be trivial or less.
Some do filter air better than others I am sure, I guess a K&N filkter in the stock box will do.
There has been a debate as long as I can remember, but a replacement K&N filter will not "filter" any better than a OEM Motorcraft filter. The only benefit of using a K&N (and such) is that it is re-usable.
Be careful when cleaning...as the oil based filters tend to dirty the MAF sensor causing poor performance.
IMO...the dry type filters are better. Here is what I recommend...
advanced FLOW engineering http://www.afefilters.com/
OE Replacement Filter with Pro-Dry S Ford Trucks (99-04) (gas)
Part Number: 11-10004
MSRP: $45.49
UPC: 80295911006
Shipping Weight: 2 lbs
Hope this helps...
biz
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2012 FORD F250 SD CC 156" Lariat FX4 6.2L BOSS 4x4 4.30s
2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s -- Traded
1976 F150 LWB Custom 4x4 390FE NP435 3.50s
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best air filter setup, V-10
2000 Excursion 4x4 v-10 3 inch lift,Bilstein shocks,F-250 chrome grill,Helwig rear sway bar,Gibson exhaust,K&N filter, ICC lights, and repaired spark plug hole !
