It is very thin stainless. Compared to the pipe in my lightning, its pretty thin and flexible. I just checked my ecu. My idle temp is 460 F and my full throttle temp was 668 F holding the jet back and running full throttle for about 30 seconds. Thats pretty normal for a 28 lb turbine. I am never in a hurry to maiden a jet, so I definitely want to make it right.