I had just under 220bhp with;

PE Chip
Mongoose Exhaust
K&N Filter
GRS Mk1 Intercooler

Otherwise the engine was standard.

I think the highest it made on that set up was 218bhp and 229lbs/ft torque. That was a LONG time ago though now. A decent intercooler is a must though, do not skimp on that, or use the standard one for anything more than standard boost.