Hmm it seems to me that a upgrade from a 60 mm to a 65 mm TB is pretty mild. According to my MAC catalog, they recomend their 70 mm TB even for a stock intake. Heck even the 4.6 takes a 65 mm stock and they put 70 mm upgrades on those.
Of course I have a totally stock intake system except for a K&N filter and removed silencer, so I have absolutley no experience here.
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