My friend, real branded stuff costs real money. Thats also because it gives a real gain (rather than noise and power drainage).
We did a complete stage-1 for jimmysaints car and his car is FAST (and fast considering it was brand new at the time we did the upgrade, meaning it'll get faster as the engine opens up).
Also dont forget, we're importing most of these items on a special request basis, shipping fees are high not to mention duties are HIGHEST on car parts.
Anyway good luck with your car (y)