pulled my ecu cover off and had nice little surprise :) Polar performance chip
 

hey guys,
not thats its any use to me anymore, i puled my 1995 jdm sti ecu cover off today before i sold it just to be sure it was stock.
To my delight i found a polar performance chip installed!!
any idea what it does, how good these are and what they are worth??

cheers guys

its worth £60-100. raises boost to approx 16psi setup for 97 ron fuel