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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...

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...

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...