What should i go with either an electric water pump or underdrive pullys? I have a 2001 5.4L supercrew with hedman headers, accel ignition, Magnaflow metalcore cats, cherrybomb dual exhaust, electric fans, predator tuner, performance products 75mm throttle body, MAC cold air intake, and throttle body spacer.
How much does each item help, which is better and how much more MPG will i get doing either of the two?
Thanks

 

Well if you go with an E. water pump you will also have to go with Efans, ditching the stock fan and going with Efans will give you a little mileage, I doubt an electric water pump or UD pulleys will however.

 

skip down a few posts and read the comments from the kid that wants to get 25 MPG from his truck----- put your money in your pocket and be happy with the truck, if you want better milage, buy a pinto.

 

like steve said, save your money. The lackluster power numbers you might gain and the possibility of gaining 1-2mpg isn't worth all the money you'll spend on the go-fast goodies.

 

They both will only gain you about 5-8 hp but the underdrive pulleys are about $140 and e-waterpump is about $225! If the manufacture claims 15-20hp increase figure 5-10hp I have always test every part on the dyno before and after installation and they always are about 10 hp off from there claims.

 

They're claims always seem to be made under the ideal situations and who knows what else they did while the truck was on the dyno. I usually just stick to the basics when i modify anything for power. Exhaust, Intake, and chip if I get the other two balanced out.