It depends on what you consider better.... 4to1 gives you a little more power, and a little different sound, but you may need to make engine adjustments. Most people would agree that the busa has enough power without any additions I do the exhaust just for sound and looks. I think the duals look better on the busa. The Rs3 usually, but I think the 08 looks better with r-22 or two brothers shorty.