MFI still chatters if you don't run a DV it's just that the metering unit muffles the sound so it's hard to hear.
Cone VS Stock...... IMO makes bugger all real world difference, once it's gone through your turbo thats being heated by 800deg exhaust gasses and then cooled down again by your IC the temp that it entered the turbo at is pretty much irrelevant lol
In theory of course the cooler it enters the turbo the better..