Here is an exhaust company which is right on par with Akra. Look through their offerings, which are a piece of art IMO. Lambo, Ferrari, Maserati, Bentley, high end Audis. You will be hard pressed to find an exhaust higher than $6K (with the twin-sound Lambo exhaustr being the exception).
At the end of the day, the end cans of the 1///M are fairly primitive relative to what is required to analyze, design, construct, fabricate, and deliver a complete exhaust for the above cars. If the buyer base ^^^ ain't paying more than $6K on $200+K cars, who thinks buyers of a $47K car will be paying $6K on an exhaust...
http://www.capristoexhaust.us/default.asp
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2011 BMW E82 1///M: AW, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods
1988 BMW E30 M3: Hennarot, S14, stock
2018 Porsche 991.2 GT3: PtS, CXX, LWBS, PCCB
1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister II + Fabspeed exhaust
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods