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How is the Tom's diffuser attached to the rear? Purely via 3m tape or does it get screwed into the actual bumper. Under side is ok, I just don't want to damage the visible parts.
there is no drilling require for the Toms diffuser. It’s held up by double sided tape and line up with the existing holes underneath the bumper which then a push clip hold it all together. takes 20 mins to install
My car with Tom's diffuser, carbon Wald spoiler, shaved emblems
http://www.flickr.com/photos/streetxdreamer/7818810094/http://www.flickr.com/photos/streetxdreamer/7818810094/ by http://www.flickr.com/people/streetxdreamer/, on Flickr
I don't think the Ventross/Vorsteiner is that bad. I believe it was the only rear diffuser available when the IS-F's were first out, that's why I chose it.
If I had another choice, I'd probably go with the downforce usa.