Your friend should have a sticker on his car that indicates the options.
This is a 993 sticker but if you find the C36 code - all the numbers after it are options. The CXX code is the country code. The 88 should be close to the same.
The three digit numeric codes are easy to find. There are dozens of code look-up sites using a search engine.
The odd-ball codes are the ones that start with a letter then two numeric characters. They are grouped options and they are a bear to figure out without a lot of digging. However, they are not usually huge $ options sets. Lots of times interior upgrades (e.g., color matched e-brake and shifter boot).
