I have the Nismo...I love it, sounds great and the throttle response is alot better. The other nice thing about the Nismo is that it is covered by my Nissan Factory warranty because the dealership added it. God forbid you have an issue, its one thing a the Nissan dealership might not warranty because it is not a Nissan part....but if they see Nismo you shouldnt have an a problem....to me its worth the little extra $ for the Nismo.
Not true, the NISMO intake is R-Tune (Race-Tune) and not supposed to be accepted by dealers.(all S-Tune is accepted...only S-Tune though) As far as voiding the warranty, you're covered under the Magnusson-Moss Warranty Act and they can't void your warranty until they find out the mod caused the problem. And i've thought it out before, it will end up costing them more to do all of that, than to service your 350Z...as long as you can hold out long enough.
I'd go with the cheaper of the two.. the pop charger. They both will have similar gains.. and you won't feel either anyways so it really doesnt matter does it? The sound is demonic at WOT above 4K rpm with the JWT. Sets off car alarms if your right next to them and at or near redline!! (Or maybe thats the exhaust doin that)
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