Welcome to the Left Coast and you'll love the car scene in LA!
People tend to band together by the cars they like.
In your case since you like Porsche, be sure to look up the Aryan Brotherhood - they seem to prefer German engineering.
As for the Holden/General Motors type crowd, you'll find MS-13 are (obviously) into the numbers on cars like hp, torque and gross vehicle weight.
The Latin Kings are also a Holden/General Motors type crowd, but they tend to accessorize their cars with a Latin flavor. They seem a fun group though.
If you like Asian cars, the clubs to check out are the Yakuza and Wah Ching. They seem to have a lot of "fan boys".
Then finally, the longest standing car clubs in LA are the Bloods and the Crips. They really go their separate ways and don't have much in common, so going between the 2 groups until you pick the one you really like is highly recommended.
Hope that helps!
