Peashooters here as well. Highly recommended. Not much louder than stock unless you "blip" the throttle or wind it out. Very neighbor friendly unless you want to make a statement. Smaller, lighter than stock.
No rejet reaquired but you will have to adjust to a richer mixture. I let a shop do mine. I only run with the "inserts" in. Great workmanship, expensive but worth it and no longer in production