I actually bought one of these recently and it's sitting in my flat waiting to be fitted. I'll let you know how it fits over the weekend although I expect a little alteration will be needed for NA cars as looking at the second image in the e-bay page you can see about half of the air vents are covered. So you'd either need to bend the ends upwards or cut the ends off although I don't know if that would actually cause a performance decrease. BTW, the slam panel is burnt TI unlike the second image which just appears to be polished/silver.
Having said that, I'm planning on supercharging (probably next year) so my slam panel will stay flat as those air vents won't be used. The current plan is to get the GTM supercharger but get some custom burnt ti tubes made, along with this slam panel, weapon-r burnt titanium tanks and some gram lights 57s pro with titanium style lip... I reckon that would make a nice little project "kuro rainbow".