If you think you can spare $10, I can tell you how to build your own MILs. I just did that last week and I have had no problems with my SES light. The one thing that the SES light effects is your gas mileage. When I first put my Pro-Chamber on two years ago, my mileage went down and after the LT/X pipe install it was still on and mileage sucked even worse. I bought the parts from Radio Shack, put them on and now I am averaging 26 mpg now, as opposed to about 17 before. For the amount that it will cost you to build them, it will save you more than that in gas until you get your tuner.