Ok, dumb question, but what do e-fans and underdrive pullys do?Are they benificial for me to have and what are the pros and cons to having them? Thank you for any info!
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2005 F150 XL 5.4L ext.cab,longbed 4x4
Volant w/ ram air intake,Magnaflow catback duel exhaust, 3" Bushwhacker flares, Eagle alloys(7 lug rims), BFG All Terrain T/A's, JVC KD-NX 5000 W/ nav, dvd, Sirius, am fm cd w/ 12 disc changer, chrome w2w nerfs, Xcal ll Troyer custom tunes
the underdrive pullys will give you a slight HP gain but i dont think you will notice it. the e-fans are the way to go because you take a big load off your engine by taking out that damn fan clutch so your gas miliage will improve. and a little HP gain. all of it wont be a shocking difference but you may be able to tell. In my opinion, its a good idea to install. you will have that peace of mine that your engine is not working as hard to push you down the road.
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2004 F150 FX4 5.4 L
1972 F100 360/390
CURRENT MODS:
exhaust
leveling kit
diablosport predator
CAI
the underdrive pullys will give you a slight HP gain but i dont think you will notice it. the e-fans are the way to go because you take a big load off your engine by taking out that damn fan clutch so your gas miliage will improve. and a little HP gain. all of it wont be a shocking difference but you may be able to tell. In my opinion, its a good idea to install. you will have that peace of mine that your engine is not working as hard to push you down the road.
Thank you for your response. Think I'll start looking for some e-fans
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2005 F150 XL 5.4L ext.cab,longbed 4x4
Volant w/ ram air intake,Magnaflow catback duel exhaust, 3" Bushwhacker flares, Eagle alloys(7 lug rims), BFG All Terrain T/A's, JVC KD-NX 5000 W/ nav, dvd, Sirius, am fm cd w/ 12 disc changer, chrome w2w nerfs, Xcal ll Troyer custom tunes
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2005 F150 XL 5.4L ext.cab,longbed 4x4 
