My favorite sealer is 3 Bond 1211. Apply sealer to the male part of the pipe. slide the back half over the front. A berm of sealer will form as you slide the pipe together. Wipe off the excess sealer and install the adjuster bolt. If you can let the sealer set up for a few hrs it is better.
The length adjustment allows you to move the powerband up or down in rpm. Longer gives more low end or shifts the powerband down in rpm. Shorter move the rpms higher or shift the powerband up in rpm.
The pipe were designed to work with our grand national engine kit in 1996. We were running 186' to 188' of exhaust port timing and the power peak was at about 7800 rpm. We found this to give the most acceleration out of the turns, while still giving good rev out. I have to give a lot of credit to Gary Denton for never letting me forget that acceleration is more important that peak hp. We used this pipe To win XC champions ships with Barry Hawk and Bill balance from 1992-2003.
This pipe was used to win over 25 National championships. We used this pipe to help Jeremiah Jones win the last 250 National championship on a 250R in 2003.
That philosophy developed on nation MX, TT and XC race tracks, applies to the sand. Pulling paddle tires up hill in the sand requires that same type of power.