The air pump is usually the first emissions related part to come off of these cars. It can be eliminated with a Greddy pully set. But note that if you take off the air pump, you should get rid of the cat as well, because without it the cat will clog up. You can buy a set of block off plates from RX7Store to get a lot of the parts from under and around the UIM, i.e. ACV, AWS, EGR valve etc. However, some notice a rough idle without the air pump as I did, but this can be fixed with the addition of a properly tuned Power FC.
Here's the link to the Pulleys and BOPs.