2004 jdm evo 8 mr 340
hi just wanted some advice
i have e8 mr 340 which has another little silver box connected to the engine ecu , i assume this is a piggyback ecu.
i have read my rom sucessfully with ecuflash 96260007
if i was to change to tephra v5 or v7 would it be advisable to leave the piggyback connected or to remove it