The only way to be sure is do back to backs on the same day with the different intakes and then the different exhausts if you can. Everyone poo poos the K&N intakes but they have always given the most dyno proven power in my experience. You might be surprised if you throw them back on and you find your missing ponies. I don't know why you would replace K&N's with Takedas.
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2012 PW NISMO #0559 - GT Spec Brace Kit - Swift Springs - ARK TP & Invidia CBE K&N Intake - UpRev Tune - 15mm Z1 Spacers & Studs - StopTech Slotted Rotors & SS Lines - ZSpeed CMAK with Stage 2 Clutch and Lightweight Flywheel
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