If you don't know who Spark is yet, it's not surprising as a lot of their products are supplied unbranded as original equipment fitment for many top automotive brands. Spark are a manufacturing partner for Aprilia, BMW, Ducati, Lamborghini, and AMG amongst others. The quality of craftsmanship and welding on these is insane.
These silencers are a universal slip-on style.
Stainless steel - Scotchbrite