When did C30's get cats?

[Ziegelsteinfaust]

I have to sell my K20 down the road because I need something family friendly. So I am working on picking up a crew cab dually. Since I can not stomach buying a new truck I will build my version with out things that annoy me.

When did cats become a requirement on a California truck. I saw a ad where it was mentioned 1984 last year of no cats.

I am looking at earlier the 80 to keep smog issues down, or get a TBI version then go for LS swap.

There is a kid at work who wants it bad since the running gear is new, and I can not pass up his offer. So I want to act quickly.
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