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The intercoolers on the production CTRs draw air from the area above and behind the rear tires. This area is pretty open on the bottom of any 911, so I'd wager the majority of the air comes from there. I believe the slots in the bumper are there to help cool the area around the muffler. I have been told by people at Ruf that they abandoned the intercooler layout/NACA ducts used on CTR #1 beacause the airflow wasn't what they thought it would be. My guess is the NACA ducts were in a relatively low pressure area. They certainly weren't positioned properly for the airflow in that area of the car and a NACA duct is really better at much higher airspeeds, anyway.
Ruf built CTRs that had a Ruf VIN and also converted various previously-built 911s. I don't recall the exact numbers but I seem to recall the converted cars out-numbered the ones Ruf built from scratch, as Ruf cars. Some were made from Carreras, some from 911SC bodyshells, so they would have the dash structure and other features of those cars. A 930 had the same dash as a 911 of a given year and all of them had the later dashes from 1986.
In some countries, the year that a car is first sold is considered the "model year." That may be how the viper green one "became" an '88, as it clearly wasn't built on an '88 body shell. Another possibility is that a car can be built upon a spare bodyshell purchased from Porsche. Back in the good old days, you could actually buy a complete tub from Porsche as a spare part. Obviously, a bare tub might not have a VIN stamped in it, just like a replacement engine case came without an engine number stamping. Who knows what the story is on this particular car? You can find threads elsewhere talking about it, so perhaps the owner could share some more information on it.
JR
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