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If it runs like crap, I would get the codes to find out why. It might be a simple fix, but it could be expensive as well. If you put cats in the y-pipe, run O2 sims or get it tuned then you should be fine. I've done headers and cats on a 96 LT1 and 2000 LS1 and they didn't run like crap without a tune. Something is wrong like an exhaust leak or no EGR or something.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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