I have the dealership paying 850. 00 for a set of injectors on my 04 305/555. My question is, would I be better off using that money for a box and exhaust instead? I drive mostly highway, and tow anywhere from 3000-13000 lbs. I am concerned about reliability especially with injectors that only cost 850 labor included. The box I am looking at would be another Edge EZ. Thanks for any input.