If you are just planning to do stock racing for 13.5, id get the current stock spec g2 combo. Have that same one in mine but just with the previous G4 motor.
If your planning to run mod in the future, the new g3 pro combo would be good.
Just go with the current stock spec. Save yourself some money lol. Don't need the newest/latest/greatest. My uncle is still running a 8 yr old esc (Hobbywing v3.1 with a 6.5T G2 motor) in his and does just fine with other cars.
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Not my soldering lol. It was a buddies soldering all the way down in south carolina, when my original esc took a dump on me and I had to buy this current stock spec at beach rc lol. Right before racing to. It sucked but we got it running right before racing that night lol.
Receiver, you use a nb4 right? so self explanatory, just get a receiver for that.
Servo, I'm using like a 10 yr old servo in mine, I know its outdated but works for me, but most racers I seen like protek and nitro pro low profile servos.
Batteries, I'm using CNHL racing series packs and been serving me well for the past year. Used Maclan batteries in the past and those were great. Most local guys tend to use ProTek packs. My uncle personally likes SMC and ProMatchRacing. Really no right or wrong way to go. Just personal preference and budget.
And we all know
@Littlemotor LOVES NitroPro