personally...for a N/A car i would suggest using HKS Hiper or the 5Zigen exhaust. Both have pipe diameters tuned for our N/A cars.
I have the hiper on my car...and i couldn't be happier...
But there are people with a'pexi N1 on their cars with good results also...
but i do think 2.5" exhaust for N/A is perfect for our application...
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