Customer of ours lost a boost pipe mid-slide at a show at the weekend and ended up putting his R34 Skyline into a wall. He already had a tube front but needed something a bit more substantial:
All built out of 1 3/4" PTG, however now it's a little too strong! We have had to modify it with some crumple zones so that if there was another hit, it would take the damage instead of the chassis.