Originally Posted by iminhell
BBK is 1mm larger than stock, CFM is 2mm larger.
If that convinces you to spend $250 so be it. I don't think it's worth it.
Stock: 20.5735 in^2
BBK: 21.2114 in^2 (0.6379 in^2 larger than stock)
CFM: 21.8591 in^2 (0.6477 in^2 larger than BBK)
I don't see how this can be....
I remember when I had my old FC 65mm TB, my stock SVTF TB would actually fit inside the the FC 65mm TB. I wish I took a pic to show it.
As for the OP, I have only seen one a normal zetec BBK TB, the outsides of it isn't as smooth as the FC or CFM ones. But it worked perfect like the others. Find someone with a Powerworks SC kit installed. I think some of those kits came with a larger BBK TB.
But TurboTom is correct, i liked how everyone ignored him. A bigger TB will not yield HP gains, just better throttle response and a stiffer gas pedal due to the stiffer spring on the new TB. Porting the stock TB would be the more economical move or find one used...