Use f8, f9, f11, iso 100, lower iso less noise, plus tripod, take 3 frames all one step apart. ( one under exposed, one normal, one over exposed)
3 shots at iso 100 equals iso 300 in HDR because of the combining of the 3 frames. If you use iso 400 x 3 = 1200 iso = noise.
Its better not to get the noise in to begin with as it hard to get it out.
X5 F15 M50d White, 20"rims, Yellow Calipers, Ceramic Pads. Better off saying what it does not have and that's a B&O Audio System, otherwise all option boxes are ticked.