[dad]

ya know what ...I have heard all the stuff on porting your throttle body and I think it goes both ways ....

I do believe that the ported throttle body will introduce a little more air sooner than a stock throttle body, so if jumping from the start is all you think you need out of this than do it because it is cheap and effective for this and this only...

now what you have too ask yourself is how can this be of benefit too you under most driving ( read moving) conditions....you are all ready out of the rpm range that the porting will do you any good and yes you now have a bottle neck as compared too an after market unit of lets say 65mm....

I have spent the money on the Focus Central unit for my zx5....It has been a kick ass mod. In particular and most importantly when you are just slightly under the oppertune power range you can kick it and the return into power is excellent. I do think you have to qualify your needs here...what I mean is this...

for me , I drive sprited 90% of the time, handling is of absolute importance and with handling what falls directly second too that ( and to support that) is throttle response. Vertually all the "performance" mods (if you can say that about a Focus) have been done too support a better more usable right pedal both in acceleration and decelleration...if this is your needs than it is important to have the bigger throttle body ...

Now having said that by no means is my Focus any where close to being the fastest around ...but it may be one of the most drivable from a toss it into a corner pont of view...