Chas,
Body and tires are both subject to car width regulations. The +- was because some of the different manufacturers bodies were, well, different.
As to the motors, I will concur with your suggestion based on the contents of this thread and have clarified the regulations accordingly (SRP is now 1090).
JT
Body and tires are both subject to car width regulations. The +- was because some of the different manufacturers bodies were, well, different.

As to the motors, I will concur with your suggestion based on the contents of this thread and have clarified the regulations accordingly (SRP is now 1090).
JT
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