Exhaust?

LJ67barracuda340 said

'67's only came with a single exhaust also, 273 Commando and 383. I got a 2.5" Pypes dual X pipe and tail pipes under my '67 though. Slightly lower but not a lot without notching the x member

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I should have said 68 and newer. I knew the 273/318 Darts had single as the only option. In fact I don't think 273's or 318's ever had duals unless it was a police car or something like that. When did the dual transmission crossmember come out? 68 with the 340?