I like the 4.8is exhaust sound better, I don't know about the performance though... I mean I do feel that the 4.8i (E70) has a heavier ride/feel to it but really I can't complain because the overall feel of the vehicle is better with the nav and idrive and the new interior and exterior design. The 4.8is when you get in, it makes you feel like you just got ripped off. (ie, not a big fan of the interior)