I would take a stock car over a modified one especially with a JDM engine swap. If you need parts for the RB they will probably be expensive and have a longer lead time.
One thing the s14 has going to for it is consumables it will use less tire and brakes due to it being lighter but now sure how big the difference will really be.
All being said, I do love tracking my s14 its a pretty fun chassis.
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