i got a 2008 mazda 6 not too long ago, and it i have had no probems with it, but its a v4, and left hand turns on busy streets, as well as merging on the highway can be a nightmare with it, i can floor it and i wont feel any difference for a full second, what can i do (besides buying a new engine) to increase response time and acceleration. and i suppose if you know how expensive a new engine will be then you can throw it out there, i already know it will be over 4,000 at least.