Exhaust gas temps and OG heat exchangers vs pattern

Exhaust gasses can get up to 800 degrees C. This is generaly and not VW specific.
Original heat exchangers have about 25% more surface area of the internal fins than pattern parts. Less materials and tooling but crap

 

Is there a question in there??

 

No bud, just put it up as a seperate to make the information easier to find for those who may need it. Apologies if I ve posted in the wrong place

 

Not at all was just wondering