gti 16v yes. not 8v
An 8v exhaust does fit, people like bosal sell a connector piece to fit either 8v bore or 16v/vr bore exhaust from the cat back (it's straight through connector on the 16v but is stepped down 5mm on the 8v)
yup, cats are different. if i remember correctly 8v is a ceramic one, 16v and vr are metal carriers...