JUST GOT A 04 DEVILLE JUST WANDERING IF THERE IS A GOOD PERFORMANCE UPGRADE? pUT IN A NEW K&N ALSO WAS READING ABOUT A CHIP AND A VOLENT CAI. iVE OWNED NOTHING BUT MUSTANGS FROM 14SEC TO 9 SEC 1/4 MILE SO THIS SEEMS A LITTLE SLOW FOR MY BLOOD. IS IT REALLY WORTH THE UPGRADES. IT SURE IS NICE HAVE THE COMFORT THIS THING GIVES YOU.