size of turbo inlet?

[peiserg]

I'm going to buy http://store.yahoo.com/machv/macvleaktes.html to help me find if/when i have boost leaks. Since my car is currently at the shop, can anyone tell me what is the appropriate size to buy?

and can I hook this to my air intake before the air filter (where the air inlet goes into the airbox cover), or do i need to go to the turbo air inlet? My plan was to stop air escaping from the opposite air inlet (from the airbox) with a tennis ball, and pressurize the other side while checking for leaks. feasable? or do i need to actually get to the turbo and remove the air inlet hose on each turbo separately?

thanks. gerry

[42TT]

i think it would be much easier to run this through the intercooler where the turbo feeds air into as removing the turbo inlet pipe is a very ugly job