... You can alter the reflective properties of any material, with extension code , play around with it :
[SHADER_REPLACEMENT_...] ;improve carbon
ACTIVE = 1
MATERIALS = name_of_material_here
PROP_... = ksAmbient, 0.13
PROP_... = ksDiffuse, 0.08
PROP_... = ksSpecular, 0.5
PROP_... = ksSpecularEXP, 180
PROP_... = fresnelMaxLevel, 0.05 ;esp this one , lower is less reflection
PROP_... = fresnelEXP, 40
PROP_... = fresnelC, 0.01 ;esp this one , lower is less reflection
PROP_... = useDetail, 100
PROP_... = detailUVMultiplier, 14
PROP_... = detailNormalBlend, 1
DOUBLE_FACE_SHADOW_BIASED = 1...