Kyle's Cousin South Park

W said cousin's voice, also called South Park? 3

The garrison is building cars here.

update

Episode titled South Parks the IT.

Because that's the voice of Tree Parker. His cousin also appears in Episode 617, Red Sleigh Do, where he helps Cartman determine how often he is good or bad.

Note: The episode you call is actually called The Eny. )

Kyle's Cousin South Park

South Park Sound
They are Trey Parker, Matt Stone, Mona Marshall or Eliezer Schneider. Sorry, I can't ban it, but I think it's Tree Parker because he looks exactly like him.
(Can I give the best answer?)