Desert Aircraft advised me not to cut the header pipe shorter than 10-1/2 inches in length for the DA-50R. I measured and cut off only 1-1/8 inches, which allowed me to have a pipe that was 11-1/4 inches long...whew!

It is worth going over the dimensions of the canister mounting piece to make any subsequent canister mounting experience MUCH quicker and easier. It took me at least an hour to get that canister mounting ring to fit properly, line up the canister so it is in the proper position to accept the header without stressing the coupler. At least it fits nicely so the glue will hold when I do the final assembly.