i'm not sure i have already present the only astra in the world woth this configuration...
it's an astra z20let which is now another car. i've fitted:
1 big turbocharger : td05-16G from mitsu evo 8
1 big intercooler for mitsu evo 8
1 admission from APEX'I
4 big injectors astra VXR (570cc)
all the intercooler pipping
1 manifold for the mitsu evo 8 turbo
i overboost to 1.5 bar and boost to 1.2 or 1.3 bar so i have without the remap 300 HP
i will fit a Greddy e-manage (piggy-back) and gain 40 HP more.