What to do before n54 turbo upgrade

cmcleod07

Newbie
Points
1
Location
st louis
Car
2007 335i
Hey there, I have a 2007 335i and was curious as to what I should upgrade before upgradibg to bigger turbos, I bought one 10 days ago, proceeded to get a dunan stage 2 tune and blew up the engine, while the engine is on the table I figured I might as well replace the turbos to
 
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