dont mess with the intake at all without a tune on a IX, and I wouldnt go upping your boost without a tune either. Exhaust you should be ok as long as your not hitting fuel cut from your boost going up a bit

 

the best thing you should do is start with a Warrtalon stg 1

 

someone mentioned the potential for boost pressures changing after mods, which is a good point. the green line on those first two charts depict boost vs. rpm. you'll notice two things:

1. max boost increased after parts. at all RPM, boost was greater, after parts.
2. draw a rough trendline from about 3400-7000 RPM and you'll see that, after parts, there is less deviation about the norm. and the slope of the trendline is less steep.

so, a little more boost that doesn't drop off as hard and the motor generates more and smoother power. my subjective driving experience agrees with that.

so, long story short, enjoy the exhaust! the sound alone is worth like 5hp!

 

i would install all the parts even without money for a tune.

Would also get a Fuel Pump.