Just for a little balance, some years ago I went to Armours shop to pick up a complete exhaust system for a Triumph GP replica I was building. I wanted the so-called "cocktail shaker" silencers (which allowed race entrants to remove the rear cap and tailpipe from thier road bikes, and compete on the track) which could have lead to many problems.
I was invited to unwrap as many down pipes as I wished and pick the best chrome (they were all excellent).
Back home, the whole kit fitted millimetre perfect, AND the tail pipes pointed rearwards perfectly parallel to each other, and that ain't easy when the megga part is both tapered and pointing upwards.
100% satisfied with the service and parts received. I couldn't fault them.