Just got back under my GTI the other day and decided to check on my resonator delete welds, happy to see that it’s all still holding up!😂 I used a size 8 cup, before I knew I should use a much bigger cup for stainless pipe, and I used 309L filler because I wasn’t sure what grade of stainless the original exhaust pipe was. My heat management was NOT good but I for sure learned from it