I have SS pipes, and in the last year havent had a single second glance from PC plod. Riding in th country, or in the city every day (past many police)
They are loud but not out of control. Ordered them from Dale at Speciality spares. Cost about £180 incl import dutys. have no complaints at all.
search You tube for ''triumph america speciality spares'' and see my short clip there. Also posted a stock pipes clip so you can see the difference.
that was the single best purchase i made for this bike.
