[r33_RGSport]

@fung0001, the chargepipe will not make much difference power wise, but it will give you a better stability on the boost. Since the aftermarket usually made of stainless steel pipe or aluminum which doesn't flex or deform during high boost. Also, the OEM, between the plastic pipe and the plastic flange, it is only plastic weld. I've seen a stock charge pipe blown off within a year or few year of car ownership.
Also, since your car is 520i, ER doesn't have the chargepipe for it. ER only make N20/N26 chargepipe for the F2x 1 series 2 series and F3x 3 series 4 series.