do you have equal or unequal length shortys? Either way, I would probably still look into doing it even though you car already is making good power @109mph. I put a set on mine about 2 months ago and they helped alot, but mostly on the top end; the shortys definitely had better low end on my car. I was lacking top end, so I was pleased and am still glad I did it. It is a really noticeable change. Good luck
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