I am leaving mine alone he says for a year to himself.
GT350 intake, GT350 throttlebody and GT350 CAI is around $1500 and about $500 to tune it, so all in your looking at $2000 and on a UK car it will probably net around 55-70BHP so not too shabby at all plus of course a new redline of 7800rpm as peak power if shifted to 7500rpm with new intake.
But I am happy to sit back and watch from a distance as guys in the US are fitting BOSS 302, Pro Jet and 350 manifold intakes, though the 350 does make the most sense, basically replicating what Ford did with the Shelby and what is proven to work and be safe on the Coyote.
Or I could just hold tight and go ahead with the original plan of upgrade the oil pump/gears and fit a Whipple super charger kit, that way I still have a new peak power of 7500rpm but I also have around 750BHP so a good 300+ horsepower gain and that will cost $10,000, so more but a much larger power gain.
If a lot of guys go the 350 intake route and have good results I might visit that as an interim to supercharger as good thing is any modifications are easy to sell/move on.
Yeah with the GT car you can upgrade to the 12 speaker Shaker 1000 system which I have optioned for, so hoping that is OK, most say once it is custom setup it is quite a nice decent sounding system, there is better but for factory system it is ok.
Am sure you can fix the sound system easily, just take it to the right place to get it sorted.
If you get a wing made up for $500, grab two, I shall take one of you m8 as for that money it is worth the risk of it looking terrible on a regular GT.