Hey everyone, Ran a search every where and i can find the diameter of the piping once the plastic T piece is removed from the stock intake system. Even with the aftermarket stuff (doolz intake measurements non existent) etc. I have attached a picture of one side of the intake i assume they would be both the same measurement lol. I have stolen the picture from the forum and modified it as i don't have my own vehicle with me at the moment. Hopefully one of you can help me out. Thank you and look forward to hearing those numbers. (Not sure if TT and NA have different measurements but its for a TT).