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      03-17-2013, 06:38 AM   #29
w5pwr
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Drives: 2013 F10 M5
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Quote:
Originally Posted by nv6425 View Post
Guys, I just completed the valve opening mod and it's a nice improvement in sound. It took me about 30 minutes all in and I can notice the difference, especially at lower RPMs. If I can swing another 8-10db via some other mod, the exhaust would be perfect! My butt dyno also noticed a slight increase in response at lower RPMs, but that could be in my head...or butt.

Thanks for the detailed explanation!!
Just done the mod myself this morning and agree it does make a nice little improvement, I think the other mods too stock would result in a good sound.....

I didn't notice any change in response.
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