Pinto turbo down pipe and exhaust size

Rhys,
A 2ltr turbo with decent power will need a 3inch exhaust, with at least a 3inch dump pipe.  This is a common size for engines like SR20DET.
In my opinion, 2.25inch is too small.  Turbo engines don't like back-pressure, so usually the bigger diameter exhaust the better (within reason).
 

Cheers guys. Current system is not mandrel bends so I'll have to look to upgrade.
 
Thanks,
Rhys