Is there a big difference from a 73mm throttle body (which my truck has) to a 80mm throttle body? Is there that much more air going in or ia it not worth the 300 i will pay

 

I have a 80mm bbk throttle body on my 5.4 and I could tell a diff in it I'm happy with mine

 

so it was worth it? how hard was the install? on mine you have to swap the little motor that actuates the butterfly.

 

I felt that it was worth it it took about 45 min to an hour to take every thing off swop the tips and the other part of the throttle body very easy to do

 

What Exactly with this do for your truck?

 

How much of a difference did you notice and did it make you get better or worse fuel mileage?

 

Better throttle response all a way around and alittle more power

 

I went up 1 mpg

 

Do you have to tune your truck or can u just put it on and it will run good?

 

I am pretty sure you will have to get a tune for it to reach its maximum potential. I run a gryphon, and when I am filling out a custom tune, it has in there if I upgraded the throttle body.
I too was looking at getting the BBK 80mm... but at 300 bucks, its a hard thing to get, esp when it gets a max of about 5hp on the higher RPMs on a N/A truck like mine, I think more like 8-10 on trucks like yours roush