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dont worry about the exhaust, as long as it does not leak it is fine. I made the same hp with the stock exhaust and a boost controler than people made with straight 3" ones, and it got better spool. It was a little slower to rev north of 5000rpm though.
Leaner at idle could also be caused by higher latency injectors. At idle, latency is longer than the open time. if your injectors are a bit slower than the intended ones, it could be caused by that.
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