i plan on getting a piggyback set up, which one should i get for a t2

Safc-ii?

SAFC= junk

AEM EMS, HKS FCON, Greddy E-Manage are all good units. There are to many issues with the SAFC and roatires, it just becomes a PITA and you will more than likely improperly have the car tuned with one as every joe blow figures they know how to work one. With one of the above you need to actualy understand graphs and such to properly tune the car.
Invest in a wideband 02 as well.

safc2's a budget mod

im selling mine (brand new never used), pm me

safc2's a budget mod

im selling mine (brand new never used), pm me

whats safc??

it's a fuel computer and can somebody explain to me what they're for?

it can be used to tune the air/fuel mixture at certain rpm ranges to increase power