I have been meaning to post this. It is a tool that compares the average price of parts from 1 car to another. So if you want to know if parts cost more for one line than another it may be helpful.
http://www.rockauto.com/repairindex/
Parts for the 2007 PORSCHE CAYMAN S 3.4L cost 2.63 times the cost of parts for a 2007 CHEVROLET CORVETTE 6.0L.
http://www.rockauto.com/repairindex/
Parts for the 2007 PORSCHE CAYMAN S 3.4L cost 2.63 times the cost of parts for a 2007 CHEVROLET CORVETTE 6.0L.