The last I checked a welded shut egr cooler comprised one part. I also do care about stock appearance, but that's just me. I don't sell delete kits, and I don't like spending extra money for kits I personally don't believe I need, so my opinion may vary.
I don't go campaigning on threads about egr delete kits or anything either, but this thread is about welded egr coolers so I'm just chiming in my .2¢
Last I checked, the egr cooler outer body is pretty substantial, so how is all of that 'expanding coolant pressure' going to even develop (let alone rupture the outer body) when exhaust gasses don't even enter the cooler to begin with? Additionally (and this is just my opinion), I'd hardly call a properly welded cooler 'jerry rigged' compared to some of the delete kits I have seen for sale (I only said some). Maybe I'm just ignorant and delusional but that's just me.
The way I understand it (and it was explained repeatedly) egr cooler failures result from differential expansion of the cooler's interior matrix which contains the flow of exhaust gasses, hence they crack internally and then leak. It's not from coolant pressure. Puking is a seperate issue (that is also eliminated with either route). Either way those are moot points when exhaust gasses no longer even enter the cooler to begin with.
I'm not trying to pick a fight. Physics simply are what they are. If I'm misunderstanding what I'm looking at, then I'd like to learn what it is. I'll gladly acknowldge my fault if I'm wrong. I'm just pretty convinced I'm not.