Today I received my exhaust system from Vetterman, lead time was about a month. This is a 1 1/2" 4 into 2 crossover system with dual mufflers. The muffers also act as the muffs for cabin heat. I was able to mount up the header pipes, but my fuselage cart is in the way so I can't fit the tailpipes and hangars. Ohh well, that will have to wait.