I'd shy away from the flowmasters and grab something more flowing, like a Magnaflow.


My friend did pick up more ponies and torque on his turbo'd 4.6L Mustang after he switched from flowmasters to magnaflows, ironically.
Chambered FM design vs flow through MF design

 

Aside from that, the engine bay has quite a bit of space for a turbo.

CrazyCody93 has turbo stuff he'd like to sell. he has an old turbo i think, the manifold, and other stuff to get that turbo set up. hit him up.

 

Awesome I will look him up, thanx