yah, no need for tune. im running the HPS/KN setup right now and i like it. very smooth and quiet to the top.
btw, this am some midwest fat woman scared me when i opened the garage cause she was parked on my driveway behing my G. i was thinking WTF woman!
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and she stepped out of her car and handed me a small box with what appeared to be my new USB drive for the Z inside.
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she was a delivery person that arrived while i was opening my garage.
at least she had a sense of humor... when i said very nicely 'hi, perfect timing, how can i help you?' she looked at my cars said 'hi, im here to get my car detailed.' lol