From what I've seen on spam cans, it's not a huge risk. Just an inspection item. Then again, the rule is that connections to the engine must be flexible and I just prefer a hose to a loop. Before I noticed that my FWF kit had Van's hose and bulkhead connector, I was playing the the tubing supplied by Klaus for the Lightspeed ignitions but was worried about the heat issue. f1rocket mentioned the complexity issue for the hose to bulkhead to tubing scheme but, since I had complexity (connection to two ignition boxes and the BMA engine pod) built in, it was a no-brainer for me.