So I searched and couldn't find anything about this product. I'll put a link at the end so people can check it out. I'm hoping someone has it and it works well. If anyone has any thoughts let me know please. It is a Venom 400 Computer Moudule. It increases hp and torque by changing ignition and spark at open throttle.
Venom 400 Computer Module

Not sure about Xterras, but I know on a neon it does absolutely nothing and is a scam. Many dyno sheets can prove it. I highly see it as being a valid power boost in our trucks. Just get an intake/exhaust/headers/cams if you want some extra power. You'll be happier.

Mike