NISMO221,
The Stillen Headers and normal 370z test pipes are not necessary. The GTM Kit comes complete with the necessary turbo manifolds, hardware and down pipes with their kit. The Greddy Ti-C exhaust WILL be a nice upgrade though and sounds great on a GTM TT 370z!
If you would like to hear what a car with this setup sounds like, I invite you to come by the shop. We have a 7AT '09 370z here now that has this exact setup on it.
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