Alright so I picked up a t25 off a sr20 for 50 bucks ( good deal I know right) I'm going to external wastegate but I was told I need to weld the flapper shut on the turbo from the stock wastegate, is this true? If I don't what would happen?

 

Yes
If you don't, it will never make boost.

 

Or alternatively you could make a bracket that holds the wastegate shut.

 

I have mine safety wired shut, works great

 

Pictures please, pretty please

 

You spent 50 bucks on te trubo. Spend another 40 to have it welded shut, you cheap ****.

 

lazy too. really really lazy.