I actually have had them on my Z for like 500 miles now and I feel the throttle response gain since day one...The whole reasoning behind the ETI is so your ECU wont have a problem adjusting to the extra air flow. So If you ask me with them alone you dont NEED a tune, with more bolt on's, TP, CBE, ETC...then you should get a tune for max gains. I only didn't like how much higher pitched it made my exhaust sound so I am thinking of selling em. Let me know if your interested.
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2012 PW - 6MT | Meisterschaft CBE w/ ECV | EVO-R Front Lip | Enkei SP3-RS JDM Wheels | Sticky Hankook RS-3's | Megan Racing Springs | Hot Shift Knob | JDM Brake/Fog Light
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