What about the 85mm HKS Hiper(some call it High Power?) exhaust for turbo applications? It comes with a silencer so you won't be super loud with your NA engine and once the turbo is on, the silencer comes off. Plus the HKS ships in several parts as opposed to the Apexi N1 one piece. It might be more exspensive, but with the high shipping cost of the N1 and the silencer(should you decide to buy one) it will be really close to the same price as the HKS.
I'm not sure about power difference but I assume with the silencer you will not lose much power. You might not gain much power either but 5hp here and 7hp there really can't come compare with the XX HP or XXX HP you will gain with the Turbo.
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