engine management light

hey guys
just found out some bad news
my car has a bad problem the engine management light is on
i have bin to a few garages and they have both said that its a specialist thing so i hafta go to nissan
and its gunna cost me near on £1300
this is gunna be basically an engine rebuild so just wondered if there is any engine mods i shuld put on
any recomendations
 
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