I reached Tier 43 of Season Pass 1, which unlocked the jets needed to FULLY replicate Rocket Racer's car without that annoying fin in the way, now here is the uptodate build with the bestlooking Rocket Racer car you will find anywhere on YouTube for Lego 2K Drive

Items you'll need before building it:

Electric Sports Car: Win the Big Butte Grand Brick Arena on Class C

1x3 Wings: Buy WingShaped Pack 02 from Unkie's Emporium

6x4 Windshield: Buy Windshield Pack 02 from Unkie's Emporium

1x4 Plate with 2 Studs: Win Gold Rush on Class B

1x2 Jets: Reach Tier 43 on Season Pass 1(Premium required)