Nismo air system/Nismo Pipes

luigi90210

HPS Post MAF Tubes are a replacement part of the intake, you know the rubber accordion part of the intake after the airbox, the post maf tubes pretty much replace that with smooth silicone tubes, those with K&N Drop-in filters net anywhere from 10whp to 14whp dyno proven(search the forums if you want to see them)
they also do not change the sound of the car
and i fully disagree with you, the nismo stune exhaust is only good for about 7whp while the Stillen and other CBE systems are good for 15-18whp

ya its lighter but so are other aftermarket exhaust systems and those are cheaper and give you more power and the Nismo Intake is literally the Injen CAI with a Bypass valve you could buy the Injen CAI for $100 less than a nismo intake and gain the same power

Nismo parts are a great example of paying for the name and not the part