That is just one part of Banks "Stinger" kit for the N/A IDI. It came with the larger air cleaner lid, a larger K&N filter, a complete larger exhaust with a good flowing muffler, a free flowing Y-pipe with a pyro bung, and a pyrometer. It also gave instructions to turn up the fuel on the IP.
That guy wants too much for that thing. I sold the entire kit sans the pyrometer a few months ago for $200.
Heath