Ok, I see. So it's a matter of slightly better fuel economy. About the injectors, I have 127,000 miles and no info as to when the the trap was replaced w/ the Oxycat (I could get in touch w/ the previous owner and get that info if he has it). Replacement of injectors would be in response to trying to eke out a few more mpg's? Thanks for the feedback fellas. I appreciate it.