Definitely recommend the CPE intake, especially on the big turbo kits. On the ST280... If you want to, a new intake won't hurt, but it won't help either. On the whole, they're not absolutely neccessary on a stock engine. But, if it's a recommendation you want, CPE, since it would be the last intake you'd have to buy.
As for charge pipe... Just the hot side. My car is still on stock silicone (to intercooler) and cold side pipe.