none of those will fit, especially the 4-1 style as the downpipe comes away from the head at 45 degrees
the 4-2-1 weaponR style can be made to fit, the 4-2 section will bolt straight onto the z22se but apparently it doesn't fit under the bonnet of an astra, someone tried and it said it was slightly too big.
the 2-1 section has to be totally remade for all european cars, as the usa exhaust goes over the top of the steering rack whereas the euro cars go under the rack (well straight down really)