To buy headers or not?

nasm

Great thread, and kindly allow me to ask this question:
A friend of mine, who is a tuner, said that 370z 2014+ no need for short headers, if I put test pipes, because they improved the stock one, and if you want a header go for long tube. That what he said.

Personally, I want the short ones, because it is easy to pass the registration test every year we do. However, I have read a lot about Z1 short headers, and how effective they are. So, now my question is, is it really worth it to go for short headers with test pipes I have with catback or no, it is not worth it? In other way, am I getting with z1 short headers 10+ whp or no?

Many thanks for sharing your experiences. Highly appreciated.
NAS

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Sold: A7 370z 2014 - Stillen Catback - Testpipes - UpRev - Dropin filters - Silicon intake pipes - BC racing coil overs - Z1 Subframe collars - Z1 Engine and Trans Mounts - Oil cooler - CatchCan - Z1 brake lines. Now: I am building another car