I’m looking to replace my cat converter (partially blocked) and while I’m at it thinking of increasing the exhaust diameter and retaining the stock muffler. ESC tuning has some decently priced aftermarket units. 2013 Tiguan 155kW 4 motion, stock, no tune and not looking to. Thoughts? Anyone else...

owner of a 2008 vw golf my08 pacific. cannot find any information on my vehicle online re; car parts etc. trying to source a new cat converter as dealership has quoted $2,100 :/