hole in firewall

my buds runnin a boost gauges for hit turbo GTI. can somone explain where the hole in teh firewall is so he can run the line. thanks
ryan

BUMP.. please!

I don't understand the question. Either use an existing hole for the wiring harness or make a new one.

im asking does anyone know where one is. ive never lookd in the car. i dont own a GTI. he jsut wants to know where a hole in firewall is to run the boost gauge line.