You know it's a better deal to get the Pro S LE if you want everything! But like me I want a SB so it's better to get the 4 year warranty. Because one or two things break or something your out that money with out the full warranty, then save up and add the IDD gauge after a year or so. But you still have that 4 year warranty which is better than a 2 year engine warranty with the gauge. The IDD gauge is nice and does really work! But if I didn't get it with my sled I wouldn't take away a 4 year warranty for it! I would just add it...