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Come on guys! the second part of the question was,"Do they make a difference?"
For a couple hundred dollars, I like more then "Seems to"
If you want exact dyno numbers I'd suggest contacting Nology. I think you'll be hard pressed to find someone on here who'll spend the $140-ish dollars on a set then the extra cash on before and after dyno runs so they can sell you someone else's product. If you want an opinion, you've come to the right place, if you want concrete facts based on expensive testing, the manufacturer would be a better place to look.
Let my dying thought be that every mile was fun and let my tombstone read,"They never made one fast enough for me."
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