Aburt?

Seems that the design of the plane will not llow for 11" of header. At 10" the exit is right at the front of the LG. 12" header would put me right on the back edge of the LG. I could use the white coupling to move it back 1" but that would give me 13" from the motors exhaust to the front of the cnnister. I guess that adding 1" would have the same effect as losing 1"?