Got a R55 JCW.
Got the burger tune for the N18 engine.

What's the next step in terms of getting more power?
I don't want crazy power, don't want to blow up the motor.
What have people been doing to bump up the power safely?

 

Catless downpipe, intercooler, Manic Tune is a popular route. If you want to keep burger tune just add the DP and IC and the tune may be able to adjust, I don't know for sure though.