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  1. factory catalytic converters

    Does anyone know the difference between catalytic converter part numbers jr3z-5g232-a and jr3z-5g232-b? They are both listed as being for a 2018 Mustang GT built before 12/4/17 (my production date shows 11/17), but one is "federal emissions" and the other is "state emissions". The one real...
  2. 2018 production numbers?

    I just bought a 2018 Roush Stage 2 earlier this week. It's Royal Crimson with Roushcharger that was added by the dealership (I assume before it was sold new). I've done quite a bit of looking and haven't been able to find if there is any sort of listing or breakdown of production numbers for...
  3. Preferred combo for autox street class?

    I'm looking at getting an S550 as a daily driver, autocrosser and occasional HPDE car. I'd like something I can keep Stock legal for autocrossing and still have some fun out on the track. I've done a fair amount of reading through some of the other threads, and it's looking like an '18+ GT...
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