NASCAR is in Sin City as the circuit begins its "West Coast swing."

FOX's Marghiee Teshineh gives you the lowdown in this week's "FOX in the Fast Lane.":

Las Vegas is the second race using the new down-force package which calls for body and chassis adjustments that make driving slightly harder and after last week in Atlanta the drivers loved it.

Under the new rules, Dale Earnhardt Jr. believes he can break his winless streak in Vegas:

(Earnhardt Jr.) "With this low down force and the slower, hopefully should be a lot slower corner speeds, I think it lends itself to running the high side, which I really love. So, hopefully we can get up on that top and make some time up there and have a lot of fun in one and two, it really works well."

Driver Regan Smith wants to change his fortunes after last week's back of the pack finish and that all starts this weekend.

(Smith) "It's gonna be a very competitive race, it's gonna be a top and bottom race. It is gonna come in, last year we saw the top side come in, I know I ran it a bunch myself. You sit back and add it to the softer tire that we're going to have there, speeds are gonna be it, it's going to be super fast."

Next up for NASCAR, Phoenix and racing in the valley of the sun.

FOX in the Fast Lane, I'm Marghiee Teshineh, FOX News.