I have a 2001 ATX cougar with Injen Intake ---> Gutted Prescats ---> DMD ---> Pro Flow 75mm MAF ---> 19Lb/H Injectors ---> Custom Single Exhaust ---> Remote Optimizer and i get very bad gas mileage is there a reason for that??? Is it the injectors??? I change out the oil last time but didn't replace the filter would that be the reason??? Thanks ^.^