DiscoWagon

@Tom@TPC Racing Why don't more people just use the Cup lower front arm? Not only does it include a caster puck, but also upgrades the inner bushing, pricing isn't too bad either.

Tom@TPC Racing

My guess for why...P-Motorsport doesn't market factory race car parts to the public for street cars so not many people outside of the racing community knows, and the consumer would have to know whether a race car part in question fits on a street car(some parts do, some don't), and the consumer would have to have access to an entity that has an account, and willing to order on behalf of, and since factory race car parts are intended for replacement parts for a relatively small number of factory race cars(compared to street cars) there's probably not enough quantity to go around for everyone, and there are many aftermarket sources that are retail consumer oriented, and it is much easier to do click'n buy online than to jump through hoops, and factory race car part doesn't have dust boots, and most independent shops are likely to promote high quality aftermarket parts that are easier to acquire to best serve their customers, aftermarket parts are more structured for shop-to-consumer business model. Again, just guessing. There are many high quality aftermarket parts available, some manufactures/seller will even offer technical/setup support for their parts which the support itself can be a worth on its own to some consumers. Most(not all) aftermarket suspension parts are patterned from race car parts anyway, and sometime the parts are even further designed to improve in the new operating environment. I love factor race car parts, but I also love well designed high qual aftermarket parts as well.

spyderbret

This is actually very accurate for a guess. The guy who works on my P cars is in with PMNA due to his racing history. He can order cup parts for street cars but usually wont for most of the reasons above. Also, PMNA wont sell to just anyone. You have to have a racing team or a really good history with them to be able to order parts at all. A regular Porsche maintenance shop would not be able to order cup car parts.