Agree with Nick , here.
The VQ has been refinded from the factory, You get some WHP out of bolt ons and tune, but one thing I wouldnt invest in is headers, The PIA of install, cost of them, and added noise ( Long tubes) isnt worth it, Ex my buddy is fully bolted and tuned and he made 316 WHP ( 370 Z 6 spd) on a high? Dyno. I made 302 WHP on a "low" dyno and I have a auto AWD sedan, I'm would bet you strap his car to my dyno and we'll make very close numbers and for 5-6 WHP the headers are worth the $800 they cost + install :/ Just my .02
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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