De-catting 1995 Impreza

Hi lads, I've a 1995 Impreza uk turbo, big standard. If it's decatted will it need to be remapped? I may be fitting a decat pipe and backbox so just want to know beforehand if I can just bolt them on or should I budget for a few mapping adjustments afterwards?
 
needs to be remapped for best gains
but u.k. / irish classics are safe without a map
ran mine without a map for 3 years or so
 
Run fine after, but for best results and to get the real benefit you'd need a map.
 
Thanks for the replies lads, I'll just stick to fitting a backbox, I want to stay as close to original as possible, and also don't want the fuel bill to increase by fitting a decat!
 
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