As i said guy's "No disrespect","I'm not an expert :!: ",but mine has definatley been an improvement over the standard one,maybe it's the shorter pipe run than some of the other fmic's that i can notice such an improvement as it is claimed to have the same volume as the standard and higher flow rate without the heat soak :!: I have also noticed with the standard top mount on occasion that tootling around in traffic at low speeds then stopping the top mount has been hot to the touch, so like you say you must be on the move with your toe down to make it effective :!: