Simply, you just don't need a 70mm TB yet. If it is at a good price and you are planning a few mods later on then I guess it won't hurt.. But you really need good heads + intake. Plus, the MAF is only 55mm so there will always be that restriction there too.
I have just fitted 70mm throttle body from AU3 XR8, the tickford one with the 70mm mass air meter, it is fitted to a EL2 XR8 with the explorer manifold and it made a big difference, i just thought that buying the 65mm was not worth it so i got the 70mm
EA Fairmont Ghia Turbo, White,425kw, nine inch, tremec, EB GT leather trim, B45 simmons, For Sale $16000
it really depends on how far you want to modify your motor, a 65mm would be the best option for mild mods, but if you are considering doing going a bit further with alloy heads, cam ect... a 70mm - 75mm might be the better option.
i have the power plus egr block, not the easiest thing to fit as they are made for mustangs, all the intake is on the right hand side, i had to custom make a brace to hold the accelerator cable, delete the egr and you will also have to modify the ball linkage on the t/b aswell to suit the aussie motor, all in all it would be easier to get an au 65mm t/b and egr block(out), the au's didn't have an egr.
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