Also possible you have a fuel pump or regulator issue, it runs OK when it is trying to be rich when cold, but runs badly/lean once it is trying to run normal. Put a fuel pressure gauge into the feed line and check that too.
2 spots that my exhaust guy joined the 2 pipes together
Made a big difference. I'm now able to live with it. I can make it louder if I want by removing the HKS caps.
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