Need ideas on which HKS Exhaust is better for a 99 GST

[J-Syght]

I was tinking about buying a HKS Exhaust System, but I see that there are to different kind that got my attention, the first is the HKS Hiper Exhaust System, the second is the HKS Turbo Exhaust System, i was wondering which one would give me better results my 2G is a GST. Any ideas, or reviews about these ehaust systems?

 

[FourG63 97GST]

Its just piping and a muffler, not rocket science.
dont let it hurt your head.

maybe the difference in those two is just the size of piping,
you either go 2.5" or 3" whatever floats your boat