Stock and stealthy wins the race.
I hate noise pollution, and I loath loud pipes just for the sake of being loud.
The governments et al are gunning to regulate the hell out of bikes, don’t make things worse with loud pipes.
Spend the money on better gear, tires, suspension and road skills training. You will be way, way farther ahead.
If you do not believe read this:
"They're questioning accepting us into the housing divison because I put down on the application that I own a motorcycle."
"Motorcycle noise has been the #1 complaint among area residents throughout the United States"
Over the past 20 years, the AMA’s Government Relations Department has been forced to spend a share of your membership dollars each year fighting highway closures, curfews and bike bans resulting from citizens’ complaints about noisy motorcycles.