Be sure to have the pipe in place when you place your engine mounts.

Mine ended up with the engine @ 10 o'clock. With the standard header everything ends up pretty much tucked in along the side of the fuse. The long one interferes with the landing gear in that position, but if i had placed the engine @ 8 o'clock, the can and long pipe would have extend between the gear, and would have been fine too. (untill the landing gear gives way)