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The only emissions thing left on my car is my cat. I passed fine. All I did to pass was drive my car until I had about 1/4 tank of gas left, and add 3 bottles of IsoHeet or whatever it's called. It's fuel antifreeze, I got it at Wal Mart and it was in a red bottle. I think all it really is, is isopropyl alcohol, which I was told will burn cleaner than gasoline. Then I drove my car pretty hard on the way to the emissions place, and gave it to them and it passed fine.
This is what my car is:
1993 KA24DE with 180,000 miles.
-no intake butterflies
-no egr, the entire valve is gone, and the port is covered with a blockoff plate.
-no charcoal canister
-no PAIR valve
-my only vacuum lines are brake booster and fuel rail
-stock exhaust with a huge leak.
Anyways, maybe it could help you out. I'm not sure how strict Utah's laws are compared to other states, but I was happy with my results.
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