Nice thing about 65mm is that the SVT upper intake is already 66mm (measyured by someone) so no opening it up is required.
Some thoughts on "optimal size" for T.B. (which I admit I do not know)
1) stock exhaust is 57mm (2.25 inch), so going to 65mm may need to be accompanied by a 2.5 inch (63mm) exhaust. So this may suggest that 70mm may not add anything over 65 with >2.5 inch exhaust.
2) The stock 70mm MAF actually has a bar in the middle (holding the sensor) that looks about 10mm wide. Thus the MAF may only flow like a 60mm. Again would think that upping MAF size may be important in gaining benifit from >60mm T. Bodies.
Just throwing stuff out, this is an interesting thread.
