Hey Ive got a stock 87 quadzilla and i am about to put on the LRD adjustable pipe and silencer. I want to adjust it for top end. Right now i am running the stock carb with a 420 main jet. I was wondering what size i need to change to after installing the pipe. Oh yea i live in phoenix AZ, so my elevation is around 1,100 to 1,200 ft. Hopefully someone already has this setup and knows what size jet works the best.