I think glowing headers are a pretty clear indicator. Mixed up plug wires shouldn't cause them to glow. I don't think the firing order would create enough exra heat to do that. Sounds like the main cat is a pretty good start. Time to upgrade to a hi-flow cat.
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
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