Yep, intake and exhaust will lean you out. I had every bolt-on and took it to the dyno to get tuned. It was running a little lean, but nothing to be alarmed about. Now after the tune I have everything smoothed out, no lean spots and the power curve feels completely smooth.
Going too lean makes you lose power too, so you have to get it right at the sweet spot where its safe and it makes as much power as possible.
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