Earlydays

Yes

911Jetta

This is all I know about this:
http://www.cavallino-ferreo.com/parts.html

canuck964

My Stosek rear bumper has a slop just above the light bar.

Don't really know how effective it is.

Bill Verburg

You can drill the oe bumpers


or buy some really expensive kevlar replacements

or leaver them off

the shocks that they bolt to can also be replaced, there are some fairly reasonably priced aluminum mounts available

Gus

Wow - lot of variety out there on the best way to vent. I got around to doing my rear a couple of weeks ago - did not want to cut up OEM bumper so ordered fiberglass unit and second Aluminum bumper.. As with most fiberglass stuff I buy it needed some attention to fit properly. I drilled the used bumper section - but not as many as seen in the above post. While I was at it added a PULSE Brake light and two additional brake lights and 4 additional tail lights in the center section. One thing I did do was make a "stand off" for the license plate. It now sits about 2 1/2 inches back from the bumper to allow for air flow out the center of the bumper behind plate. Any way here are a few pictures

LPMM

I just realized that this one had some vents as well.

kos11-12

Really interesting thread, on my list too.
Gus I like what you created, I think not only it will help hot air to flow out but it could also help reducing parachute effect from all the air trap under there.