Mine only has the rear box which is mounted across the car. It does not have the other two boxes, or resonators as I learnt above. It is also stainless, I do not know the brand. Most people say it sounds great and compared with a three box car when static but revved up does not sound so different. However, on a motorway I would like it to be quieter, it is noisey.
I am told that a full three box system will add to lower end torque, can anyone confirm if that is true?
Is it true that a system made of both stainless and mild steel will be quieter than one made entirely of stainless steel? Apparently all to do with resonance. If so it may be worth adding a central box made of mildsteel, or perhaps a piece of mildsteel straught pipe.
But to reduce noise I also need to address other things eg fit of bonnet (hood), actually fit my 5 speed OD transmission, fit the last two door seals, adjust the sunroof. So the extra exhaust box is not so high on the priority list.