i have a 1987 eliminator with a 454 Big block chevy and a berkely jet drive. i am having the motor rebuilt and its getting bored to a 496 with some motor upgrades. i dont really know anything about the jet drive system so i am wondering with the more power the motor will be producing do i have to upgrade the jet drive? im in rancho cucamonga, is there anybody loacal that specializes in jet boats that can help me out? the motor is out of the boat right now so it is the best time to make any upgrades.

I have a stock 454 BBC with Glenwood water logs through transom exhaust. I want to keep the through transom but I want it to be obnoxiously loud haha, is that possible? what brand or style of headers?