Ok, lets see what you all got to say about this. BBK claims 8-15HP bolt on with there under drive pulleys and they say you can do most in less then 30 minutes. What do you think?
http://store.summitracing.com/egnsea...292+115+400456

 

I would give it a try...I have heard that they do add a bit of extra power. I wonder if anyone has any dyno results...

 

I know man I was wondering the same thing. I am sure someone in this site has got to know. Come on guys lets go, give it up

 

Troyer says there pulleys add 11.8 hp at the rear wheels and is a 1hour deal. Check it out.http://www.troyerperformance.com/cgi...talogno=528774

 

HI!... I picked up about 7RWH.P with my ASP 2 piece under drive pulley set.

 

i know my motor revs much faster and freer? with mine,btw-noissues with cooling or charging-phil

 

Hey there thumper I know this is off topic but, where did you get your hood/scoops?

Thanks!

 

Thats ok man, I get that question alot. Its not hood scoops though, Its a whole fiberglass hood. I got it at carhoods.com. Give it a look.

 

when I had my MAC pullies on I noticed the difference in power and mileage increased, that was on my '01 w/ 5.4

 

Sweet because that is what I have, an 01w/a 5.4. Thanks man. Anyone else?

 

I had to take them off though, because I installed a supercharger

 

I just installed the Troyer set on my 07 5.4 and its well worth it. I also put on the e-fan kit and that helps too.

 

Cool, thanks for the info.

 

I dont have any underdrive pulleys on my truck, but I had them on my eclipse. Its not so much that it adds power, but it reduces weight on the crank. In turn it allows the motor to rev much faster. I guarantee that if you get these pulleys, your wont have much more hp, but it will feel a heck of a lot faster. JUSTIN

 

do you still have them? I might be interested in buying them if you want to get rid of them