Not sure which 2003 Toyota Tundra In-Line Modules are right for you? We have over 1502 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"I installed the Unichip on a 2003 Toyota Tundra. I have a K&N FIPK and Cat-back exhaust system with the flowmaster 80 series muffler.
For those who are thinking about getting this, get it. It gave my truck the performance boost that I was expecting with the FIPK and Cat-back. The agressive settings recommend you run 91 grade fuel, but I was doing that anyways.
I haven't test MPG yet but I'm expecting better mileage because I don't have to downshift as often. Very happy with this install." —Corey C from Henderson, NV bought an Unichip Performance Chip for a 2003 Toyota Tundra, 4.7L V8, no TRD Supercharger.