Also consider that Suzuki didn't just schlep any old available muffler on that bike. Each and every piece was likely engineered to work together as a whole. Also carbon fiber might crunch, shatter, and turn to spacedust IF the bike is ever dropped $$
Personally I'd save the money toward your next set of tires....I'm shelling out for my SECOND pair since January for my wimpy stock 75hp CB750. While a louder exhaust might be fun, consumables (tires, brakes, oil, chain) are a necessity unless it's a garage queen.