Just mounted with bolts and srews through the lowest part of the front apron. Used the original mounting holes in the spoiler for it. Needed to use self-threading screws for the fiberglass fenders, but other than that, its sooo easy by just looking at the part and your car..
Don't know about the GTI- deeper lip spoiler, but that may be too much spoiler for this mounting method. No experience with it.
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