Not Ranked
I think the LS1 was euro 3, certainly no later. That doesn't mean your car will pass a smog test though, too many other variables. I guess the chances of getting pinged for pollution are pretty low, so long as the Police/EPA can see the cats you'll be OK. Otherwise it's a big fine for not having them - as you probably know.
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"A spectacularly fast car in a grand if dated tradition."
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