No the Platts go onto stock headers. The CES are available with either a collector outlet to match stock crossover pipe diameter and position as used with cat free TORs etc or wider if you want a longer single sided or twin CES or other aftermarket muffler system.
Those CES were originally mine with a stock collector outlet size, they were mated with a pair of stainless mufflers and cat free crossover that went to another happy owner on the forum.
I quite like the colour of the CES as they are now
@Nat67 but go back to black heat shields on the headers. The chrome version goes that colour anyway with use and it saves polishing them repeatedly.