stock type 1 rear irs on woods buggy. Would u recommend fox air or emulsions on rear. this is also a street legal buggy.

The Fox Air Shock is a suspension shock. That means it holds up weight just like a coil spring or a torsion bar.
An emulsion shock is just that, a shock.
Two different worlds.
What are you trying to do or solve?
My first reply would be anything more than a good 'over the counter' shock is overkill with stock arms.

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stock width and length trailing arms. just trying not to get beat up by the end of the day on trail rides. want a smooth as I can get ride while offroading without huge expense. I will still be using torsion bars as well

Well if your going to use the torsion bars then use emulsion shocks as the air shocks will be an expensive over kill. A set of adjustable Rancho 9000 series will work fine for your application.

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