for those still wanting to boost up their i30 I might have a suggestion that makes the deal a bit more feasable.
I'm actually using this solution for my project car(Porsche 924)
1. using a supercharger avoids the need for custom exhaust manifold
2. If you don't need AC or power steering you can use that location and belt to run the supercharger
3. To avoid oil feeding issue use a self oiled unit like the Toyota SC12(MR2 SC and Levin SC)
4. To avoid exploding your engine, run rich rather than trying to be too lean
5. Most engines can take about 6-7PSI of boost(depending on turbine output) with stock internals
Of course you will need an FPR(fuel pressure regulator), intercooling the SC might help prevent detonation with hot air coming in and make it safer.
So far you can usually get the supercharger for 200$ a piece, FPR would run you 100$
The good thing is that once you got your part list complete, this setup is usually pretty universal (aside for custom bracketing) and can be used on other small 4cyl engines
