The silicone turbo elbo that comes with the turbo kit is 3.5 dia, so that’s why the recommend their intake, their intakes inlet tube is also 3.5 diameter. Most intakes are 3 inch, so you can make them work by running a reducer somewhere or customizing it, honestly it’s just easier to use their intake. You can use your factory dv but you will have to cut up and extend your harness, their dv sits differently so it reaches. Why they don’t sell a “jumper harness” with the kit I don’t know, but once again it’s just easier to run their dv and intake, you don’t have to but it is easier. Their dv is loud also, which is either awesome or annoying depending what you like lol
I have the neuspeed discharge pipe, but had to customize and machine a coupler to make it work, the cts kit assumes your still using the oem discharge pipe.
And ya, you’ll need to tune for it, are you adding fuel upgrades? Or just staying on stock fueling?