How can I tell if I have an “slp” Camaro?

 

Door sticker on pass side should list SLP options and there is an SLP registry here.
Home : The Official Camaro SS Registry
I have a 2001 SLP SS car myself,let's see yours!

 

As Y2K suggests, pass door RPO sticker from SLP, but only for those 'models' above the base SS model.
The picture shows a four-post rear spoiler, a good indication from SLP.
Along with 17 inch wheels, a hood scoop, and WU8 on drvr door RPO sticker.
All SLP Camaros' are Z28, WU8, and Y2K on GM's RPO sticker AND SS models went to SLP for modification, GM did not have SS models, SLP did this for GM.
Base SS's modified by SLP did not come with SLP RPO sticker on pass door, but have visual options mentioned above.
SLP will let you know if your VIN was, and more than likely, modified by them when asled.