To me they are right up there with clear tail lamps and big muffler tips....On my car?...Oh Hell NO! I would doubt many streetcars go fast enough to have much, if any effect. They say the shaker on my mach 1 doesn't have much effect until 90+ mph. (And of course I would never even consider going near that fast...LOL)
2003 Ford Mustang Mach 1 w/mods (street toy)
1966 Ford Mustang Coupe 289 w/5-spd (street toy)
2005 Ford Focus ST w/minor mods (my daily driver)
1998 Ford Ranger S-Cab Flareside 4X4 (another toy)
Kia...Making Home Town Buffet look classy!