Originally Posted by Däs Schmoo

Throttle body spacers and an ignition system are completely pointless. Those are not worth your money.

Depending on the cam, you may need a better flowing intake manifold, some sort of fuel management, and raised compression to benefit fully from what they have to offer. You will need something to change the vtec engagement point and alter the fuel tables if you want it to run smoothly after putting the cams in. Valve springs may need to be upgraded depending on how aggressive the springs are. It is really just a good idea to upgrade the springs even with a mild cam.