What am I missing here?

[cali yaris]

Talking to a qulaified tuner shop is critical. That will lead you to the best path to boost. There are very few people on here that can tune a car themselves. I'm not one of them.

Garm's 5 Step Program to Successul Boost:

1. Think the project through, and make a complete parts list.
2. Buy quality, brand name parts.
3. Install professionally, especially wiring (whether or not you do it yourself).
4. Tune the system on a dyno (this is probably our most challenging point).
5. BE PREPARED for downtime - there always is.

What's the worst that could happen, it all ends up to be crap and you are out 1.6k?

um... blown motor, maybe?