Quiet Performance Muffler

[NapaMike]

Hawaii is cracking down on loud, modified scooters. I usually install so called 100cc big bore kits and performance exhausts on my son's scooters. Is there a way to have the extra power while keeping the noise down? Can you run a stock muffler on a big bore and still have similar power? What's the solution to this problem? We would like to have the power to climb hills without bogging, while not attracting unwanted, expensive attention.

Any help appreciated

Mike