Originally posted by tour96se:
been discused before, the "best" tb for n/a svt is 63mm,and n/a duratec is good with 60mm both optimized of course


Really. The "best" is a 63mm.

I disagree. For one; nailing it down to one exact size for any setup combination respectively won't work.

Then:
The SVT intake boot is ~58mm and stock MAF flow area is ~57mm.

An optimized 60mm TB has a 59mm flow area. (it's slightly above 60mm btw)

Without changing things before the TB it is not the most restrictive part. (i.e. if the TB flows 330cfm but the intake only 300cfm then the TB is large enough)

Then while taking that into consideration you also have to look at the heads and manifolds. If those can't support more airflow then the TB can support then the TB is still not the limiting factor...

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.