I have a Toyota Starlet - looking to get the 13b
 

Like the title says, i have this Toyota Starlet and im looking into gettin the S4 13B-T 86-88 model but dont know to much about them.
How are they? Do they have any problems? Whats the difference between the S4-5 in power and rielibility? is there anything i should look before buying this motor - trans- ecu- and harnesses?