Our experience with the G56 pipes (which by design have significant absorption material in them hence the girth) is that they alter the character of the noise rather than increasing the volume while freeing up the engine notably - the AR stage 1 pipes and the original pipes with baffles removed are simply open to get the flow and hence much noisier. If you want free flow without massive noise then recommend the G56 pipes...speak as happy user with no connection to G56.