I have the black RTABs on my Z4MC and can confirm that they are quiet even after about a year in there. Nice OEM+ improvement IMHO.
Originally Posted by Palantirion
p.s. There seems to be a slight increase in rear noise over bots dots and expansion joints from the blue RTABs. On my car it's barely noticeable, on a totally stock Z4 with OEM tires
the blues would probably be quite bothersome.
Euro headers w/relocated sensors|RPI scoop|K&N panel filter|KW V3s|OEM Strut Brace|RE RSMs|Zeckhausen CDV|SpeedBleeders|Stoptech Brake Lines|StopTech 4-pot BBK all around|SSR GT2-H 19x8.5/19x10|Potenza RE-11s
Texas Mile (March, 2010): 155.4 mph