Sorry to jack thread but how the hell can you compare a 370z to a Civic SI...?
lol!
Tune benefits the car in every single aspect.
Except for voiding your warranty. lol.
You will definetly feel a difference with a tune and it's convient to have because of the 5 maps you choose from.
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Love + Hardwork + Passion 
RIP SVTRacer
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