With respect, read your warranty.

 

No aftermarket part will void your warranty, unless they can prove without a doubt that it was the part that caused damage.

 

A short radio antenna.

 

NO aftermarket part will VOID your warranty... The afterarket part its self will not be covered under warranty from a dealership... Some aftermarket parts have their own warranty...

If a problem occurs that is directly caused by your aftermarket part then you have an issue... But, put the stock part back on... no one will know...

As far as NISMO parts... NISMO S-Tune products are fully covered by NISSAN Factory Warranty weither installed by yourself or at a dealer...

NISMO S-Tune products for the 350Z are:

NISMO Sway Bars
NISMO Shock & Spring Suspension
NISMO Cat Back Exhaust
NISMO Shift ***** (aluminum, black aluminum, shaft style TI, carbon fiber)

NISMO R-Tune products do not carry any warranty but will not void your factory warranty. They are also parts that are not covered under warranty anyway because they are usually wear and tear parts...

NISOM R-Tune products are:

NISMO Headers
NISMO Brake Pads
NISMO Flywheel & Clutch
NISMO Cold Air Intake

 

thank you. =]