Over £400 for backbox, £180 for middle section.
is there a SS complete, 'keep it standard' insurance friendly, system (incl manifolds) available - no additional power - same noise level etc?
Doesn't matter about power apparently. The very fact your using an SS system is a mod. Even when it's bizarrely far more expensive to replace with OEM.
In fact the very daft you use anything that isn't OEM or blueprint of OEM is a mod.
Utter utter insurance bollocks.