^^ yeah what he said so If you do the exhaust first and gain 20 and then wait to do the K&N filters you will lose some HP from the exhaust. It doesn't matter how long you wait the first mod will always show the most gains by itself, and you will always lose some from the initial mod with the second. Now, you wont lose overall from the starting point of the first say you have 20 from the exhaust that doesn't mean you will have like 18 after you put the filters in.. it just means you will show about 18 from the exhaust and 5 from the drop ins.. does that help??
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2011 WRX STICobb Accessport, Nameless Performance exhaust, COBB SF Intake, COBB downpipe, 20% tint, Work Emotion XD9's
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