Hondata S300 P28 Plug and Play package.  
This item consist of a brand new Hondata S300 unit preinstalled into a OBD1 P28 ECU
 
Ecu cover and screws are included as well.  
 
The s300 version 3 is a plug in module to the OBD1 factory Honda Engine Computer (not included) which vastly expands the capabilities of the factory ECU. Forced induction, datalogging, real time programming, Bluetooth and engine protection are but a few of the comprehensive s300 features.
Designed, manufactured and assembled in the USA.
There are rectangular frame ECU (US) and square frame ECU (Japan) versions of the s300.
The S300 uses S Manager software for tuning and datalogging.
 
Warning - Within the USA this product is legal only for racing vehicles which may never be used upon a public highway.