if you're looking for headers and/or exhaust for the 1MZ-FE you could check out the following:
Exhaust
Greddy, A'pexi, XERD, JP Performance, JIC Magic
Headers
XERD, JP Performance
I would highly recommend some suspension mods in addition to your planned engine swap.
Suspension:
Whiteline (swaybars, get em at ctmotorsport.com)
Eibach springs (I think Tein too)
Toxico or Bilstein for struts
JIC Magic FLTA2 or FLTA1 (coilovers)
I don't know if these would work on your model year but it couldn't hurt to shoot them some mail.
Have fun