Forget the extrude hone etc, just look at the X section of the 'single' oval intake port on the 2001 3.0 Vs the two 'singles' on the 2.5...the area is much larger with a lot less restriction to flow plus the lack of bifurcated intake port...time for some flowbench data...... 
V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
..don't talk about it DO IT !!!
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