Well i have a header that i pulled off Ebay for about 120 dollars and you know what? It works great and i don't have issues with the O2 sensor after i welded the rear bung into place behind the new CAT.
Like the guys over at EXD were saying is if you want to buy the ECU for the NA system just get one that can be retuned for turbo later on the line if you want to take that route. You can build a motor anyway that makes you feel happy so just have fun with it as you go forward.
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