As Rick says, you don't really want a single box system on an NA car, it will be LOUD,boomy etc...

Different car altogether but a mk2 Golf GTI 16v has 4 boxes (One incorporated in the down pipe, one in the tunnel, one across the rear beam area and a back box)

I had a SuperSprint system on mine which only had the rear silencer, deleting the other silencers apart from the one on the downpipe.

It was horrendous tbh..

Ok under 40mph and above 80mph, but inbetween,deafening.