I've found that the V6 responds well to a decent set of plugs , like the Bosch Super 4's (4 electrodes instead of the usual 1) and a performance in box filter like the Pipercross or K&N.
Makes a bit of differance to the performance but does improve the fuel economy as well as the super 4's provide a greater burn than the standard plugs and the filter allows the engine to breath easier
