I'm not picking on you Ed, it's just that the PCA rules and the SCCA rules work very much to cross purposes. Both have objectives that they try to accomplish, but they follow different paths. A perfectly built Class-G car such as this is "neither fish nor foul" in the SCCA world. It's too prep'd for the IT class, while the engine and suspension are nowhere near prep'd enough to be competitive in GT2. (Right now there isn't a Prod class that allows 3 liter motors, but that's due to change). The same applies by the way if someone where to take an IT car over to PCA. The IT engine rules would not be legal for the "Stock" classes, but yet they're merely a drop in the bucket compared to what is needed in PCA's GT class. Lots of people just assume that because something is legal in one sanctioning body, that it must also be legal in another. It just aint so! The whole situation is nether good nor bad in my book, it's just what the world is.
That being said, a person could buy your car, strip and sell the "illegal" parts to recoup some of the purchase price, and then get some stock parts from a dismantler to put the car back in IT spec. This very well may be a more economic path then buying a stock car on ebay and preparing it to IT rules comparable to the work that your shop has done. The caveat is that the buyer (and a seller who wants to be helpful) really need to read
the rules, and in the case of the SCCA, the monthly
updates, corrections and revisions.
You make the point that it's an awful lot of trouble to go to, to make the car slower. If it's ultimate speed that the buyer wants, I'd recommend buying a Radical or strapping a sport motorbike engine onto a kart. If you want to race on a somewhat level playing field with other Porsches, take the car as it exists to PCA's G-Class. If you want to mix it up with on a comparably level playing field with BMWs, Mazdas and various other hot cars in a multi-manufacturer race, then convert it and go SCCA IT racing. To be honest, I doubt that the driver in the car during the heat of the battle is going to notice a huge difference. Is Bill Auberland less of a racer for racing in the slower Grand-Am Cup series then when he races in the faster Speed Touring series? Nah, he's flat out and having a blast in either car. Is a Speed Touring car any "better" then the slower "Grand-Am Cup" car? No. They're just different solutions developed for different sets of rules. Both of the Turner Motorsports BMW's are pretty highly modified and tuned within the rules under which they will be competing.